s2
--:--:--UTC

Searching APEX

Starting…

  1. ○ Searching Threats, IOCs & Threat Intelligence locally
  2. ○ Querying external providers
  3. ○ Asking AI Forensic Validator
  4. ○ Creating new entry from validated hit

0s elapsed

CVE-2026-34002

📛 CVE Title

Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling

⬇ Download JSON ⚠ View as Threat

Description

A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.

Overview

State
PUBLISHED
Assigner (CNA)
redhat
CVSS severity
MEDIUM
CVSS score
CVSS 6.1 / 10 6.1 6.1 / 10
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Effective score
6.1 / 10 MEDIUM source: CNA overview
CWE(s)
CWE-805
Reserved
2026-03-25
Published
2026-05-05 16:41 UTC
Last updated
2026-05-06 16:27 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34002.json
Linked Threat
CVE-2026-34002 — CVE-2026-34002

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-05 16:16:11 UTC
NVD last modified
2026-05-07 14:39:15 UTC
NVD CVSS v3.1
CVSS 6.1 / 10 6.1 6.1 / 10 MEDIUM source: secalert@redhat.com
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Exploitability subscore
1.8 / 10
Impact subscore
4.2 / 10
EPSS score
0.0003 (probability of exploitation in next 30 days)
EPSS percentile
8.58% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 12:41 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-27343
Assigner
redhat
Published
May 5, 2026, 2:41:10 PM
Updated
May 28, 2026, 5:07:06 PM
EUVD base score (CVSS 3.1)
6.1 / 10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
EUVD-reported EPSS
0.0300
Vendors
Red Hat
Products
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (patch: 0:1.11.0-22.el9_0.17)
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (patch: 0:21.1.3-13.el8_8)
Red Hat Enterprise Linux 9.4 Extended Update Support (patch: 0:1.13.1-8.el9_4.9)
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (patch: 0:1.20.11-18.el8_8)
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (patch: 0:21.1.3-2.el8_6.6)
Red Hat Enterprise Linux 8.8 Telecommunications Update Service (patch: 0:1.20.11-18.el8_8)
Red Hat Enterprise Linux 10.0 Extended Update Support (patch: 0:24.1.5-6.el10_0)
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (patch: 0:1.20.10-4.el8_4)
Red Hat Enterprise Linux 8.6 Telecommunications Update Service (patch: 0:1.20.11-7.el8_6)
Red Hat Enterprise Linux 8.8 Telecommunications Update Service (patch: 0:21.1.3-13.el8_8)
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (patch: 0:1.20.11-13.el9_0)
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (patch: 0:1.20.11-7.el8_6)
Red Hat Enterprise Linux 9.6 Extended Update Support (patch: 0:23.2.7-6.el9_6)
Red Hat Enterprise Linux 9.4 Extended Update Support (patch: 0:22.1.9-8.el9_4)
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (patch: 0:1.12.0-14.el9_2.14)
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (patch: 0:21.1.3-10.el9_2)
Red Hat Enterprise Linux 9.4 Extended Update Support (patch: 0:1.20.11-28.el9_4)
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (patch: 0:1.20.10-4.el8_4)
Red Hat Enterprise Linux 8.6 Telecommunications Update Service (patch: 0:21.1.3-2.el8_6.6)
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (patch: 0:1.20.11-20.el9_2)
Red Hat Enterprise Linux 7 Extended Lifecycle Support (patch: 0:1.20.4-34.el7_9)
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (patch: 0:1.20.11-7.el8_6)
Red Hat Enterprise Linux 9.6 Extended Update Support (patch: 0:1.20.11-33.el9_6)
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (patch: 0:21.1.3-5.el9_0)
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (patch: 0:21.1.3-2.el8_6.6)

ENISA description: A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.

EUVD references (20)

Affected products (11)
VendorProductVersionsPlatforms
Red Hat Red Hat Enterprise Linux 10 — —
Red Hat Red Hat Enterprise Linux 6 — —
Red Hat Red Hat Enterprise Linux 6 — —
Red Hat Red Hat Enterprise Linux 7 — —
Red Hat Red Hat Enterprise Linux 7 — —
Red Hat Red Hat Enterprise Linux 8 — —
Red Hat Red Hat Enterprise Linux 8 — —
Red Hat Red Hat Enterprise Linux 8 — —
Red Hat Red Hat Enterprise Linux 9 — —
Red Hat Red Hat Enterprise Linux 9 — —
Red Hat Red Hat Enterprise Linux 9 — —

Affected products — CPE 2.3 (6) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:a:x.org:x_server:-:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

Vendor references (2)

References embedded in the original CVE record by the assigning CNA.

MITRE references (2) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (31)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (16)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

  • cve-details - Red Hat Customer Portal
    web:access.redhat.com

    Learn about our open source products, services, and company. You are here

    2026-05-23 21:14 UTC
  • CISA Warns of Exploited Microsoft Defender 0-Day Flaws
    web:cyberpress.org

    The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

    2026-05-23 21:14 UTC
  • Security Update Guide - Microsoft
    web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-05-23 21:14 UTC
  • CVE-2026-34002 - security-tracker.debian.org
    web:security-tracker.debian.org

    Vulnerable and fixed packages The table below lists information on source packages.

    2026-05-23 21:14 UTC
  • April 2026 Patch Tuesday: 163 CVEs, critical issues, and the unpatched ...
    web:windowsforum.com

    Microsoft's April 2026 Patch Tuesday lands as one of the busiest security releases in recent memory, with 163 vulnerabilities closed across Windows, Office, SharePoint, .NET, Visual Studio, Dynamics 365, SQL Server, Azure, Defender Antimalware Platform, PowerShell, and related services. The...

    2026-05-23 21:14 UTC
  • Microsoft releases emergency patches for critical ASP.NET flaw
    web:www.bleepingcomputer.com

    Microsoft has released out-of-band (OOB) security updates to patch a critical ASP.NET Core privilege escalation vulnerability.

    2026-05-23 21:14 UTC
  • Critical Patches Issued for Microsoft Products, April 14, 2026
    web:www.cisecurity.org

    <p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...

    2026-05-23 21:14 UTC
  • National Vulnerability Database | NIST
    web:www.nist.gov

    NIST maintains the National Vulnerability Database (NVD), a repository of information on software and hardware flaws that can compromise computer security. This is a key piece of the nation's cybersecurity infrastructure.

    2026-05-23 21:14 UTC
  • Oracle Critical Patch Update Advisory - April 2026
    web:www.oracle.com

    This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-05-23 21:14 UTC
  • Patch Tuesday May 2026: Security Updates & CVE Analysis
    web:zecurit.com

    Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

    2026-05-23 21:14 UTC
  • RHSB-2026-002 Cryptographic Subsystem Privilege Escalation - Linux ...
    web:access.redhat.com

    Remediation Timeline Given the interest in how this vulnerability was disclosed and remediated, the following timeline outlines the key events. 2026 -03-23 Reporter privately contacts upstream 2026 -03-24 Upstream acknowledges receiving the report 2026 -03-25 Upstream/Reporter propose and review patches 2026 -04-01 Upstream commits patch to ...

    2026-06-03 07:49 UTC
  • Microsoft Patch Tuesday April 2026 - 168 Vulnerabilities Fixed ...
    web:cybersecuritynews.com

    Microsoft has released its April 2026 Patch Tuesday security update, addressing 168 vulnerabilities across its product portfolio including one actively exploited zero-day and one publicly disclosed flaw that organizations must prioritize immediately.

    2026-06-03 07:49 UTC
  • Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...
    web:cybersecuritynews.com

    Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

    2026-06-03 07:49 UTC
  • Security Update Guide - Microsoft Security Response Center
    web:msrc.microsoft.com

    Security Update Guide - Microsoft Security Response Center

    2026-06-03 07:49 UTC
  • NVD - Home
    web:nvd.nist.gov

    The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...

    2026-06-03 07:49 UTC
  • April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-06-03 07:49 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-34002.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-34002",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-06T14:27:00.488000Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-06T14:27:54.934Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
          ],
          "defaultStatus": "affected",
          "packageName": "xorg-x11-server-Xwayland",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
          ],
          "defaultStatus": "affected",
          "packageName": "tigervnc",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
          ],
          "defaultStatus": "unknown",
          "packageName": "xorg-x11-server",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
          ],
          "defaultStatus": "affected",
          "packageName": "tigervnc",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
          ],
          "defaultStatus": "affected",
          "packageName": "xorg-x11-server",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "defaultStatus": "affected",
          "packageName": "tigervnc",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "defaultStatus": "affected",
          "packageName": "xorg-x11-server",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "defaultStatus": "affected",
          "packageName": "xorg-x11-server-Xwayland",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "affected",
          "packageName": "tigervnc",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "affected",
          "packageName": "xorg-x11-server",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "affected",
          "packageName": "xorg-x11-server-Xwayland",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Red Hat would like to thank Jan-Niklas Sohn (TrendAI Zero Day Initiative) for reporting this issue."
        }
      ],
      "datePublic": "2026-05-05T14:01:46.686Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://access.redhat.com/security/updates/classification/",
              "value": "Moderate"
            },
            "type": "Red Hat severity rating"
          }
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-805",
              "description": "Buffer Access with Incorrect Length Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-05T14:41:10.065Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2026-34002"
        },
        {
          "name": "RHBZ#2451112",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451112"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-03-25T07:09:50.953Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2026-05-05T14:01:46.686Z",
          "value": "Made public."
        }
      ],
      "title": "Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling",
      "workarounds": [
        {
          "lang": "en",
          "value": "To mitigate this vulnerability, restrict access to the X11 server. If the X.Org X server is not required on a system, consider disabling or uninstalling it. For systems where the X server is necessary, ensure that access is limited to trusted users and networks. This can involve configuring `xhost` or implementing firewall rules to restrict connections to the X server. Any changes to X server configuration or service status may require a restart of the X server for the mitigation to take effect, which will impact active graphical sessions."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-805: Buffer Access with Incorrect Length Value"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-34002",
    "datePublished": "2026-05-05T14:41:10.065Z",
    "dateReserved": "2026-03-25T04:53:13.615Z",
    "dateUpdated": "2026-05-06T14:27:54.934Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}