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CVE-2026-28959

📛 CVE Title

CVE-2026-28959

⬇ Download JSON ⚠ View as Threat

Description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. An app may be able to cause unexpected system termination.

Overview

State
PUBLISHED
Assigner (CNA)
apple
CVSS severity
high
CVSS score
CVSS 7.5 / 10 7.5 7.5 / 10
CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Effective score
7.5 / 10 HIGH source: CNA overview
CWE(s)
—
Reserved
2026-03-03
Published
2026-05-11 22:07 UTC
Last updated
2026-05-12 21:53 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/28xxx/CVE-2026-28959.json
Linked Threat
CVE-2026-28959 — CVE-2026-28959

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
2026-05-11 21:18:56 UTC
NVD last modified
2026-05-13 14:36:21 UTC
NVD CVSS v3.1
CVSS 7.5 / 10 7.5 7.5 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore
3.9 / 10
Impact subscore
3.6 / 10
EPSS score
0.0008 (probability of exploitation in next 30 days)
EPSS percentile
23.04% vs all CVEs — higher = more likely to be exploited, as of 2026-05-25

NVD-assigned CWE(s): CWE-120 (differs from the CNA list above)

NVD / KEV / EPSS data refreshed 2026-05-25 17:22 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-2026-29264
Assigner
apple
Published
May 11, 2026, 8:07:29 PM
Updated
May 12, 2026, 7:53:57 PM
EUVD base score (CVSS 3.1)
7.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EUVD-reported EPSS
0.0800
Vendors
Apple
Products
watchOS (0 <26.5)
tvOS (0 <26.5)
visionOS (0 <26.5)
macOS (0 <14.8.7)
iOS and iPadOS (0 <18.7.9)
iOS and iPadOS (0 <26.5)
macOS (0 <26.5)
macOS (0 <15.7.7)

ENISA description: A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. An app may be able to cause unexpected system termination.

EUVD references (8)

Affected products (5)
VendorProductVersionsPlatforms
Apple iOS and iPadOS 0 (affected), 0 (affected) —
Apple macOS 0 (affected), 0 (affected), 0 (affected) —
Apple tvOS 0 (affected) —
Apple visionOS 0 (affected) —
Apple watchOS 0 (affected) —

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:o:apple:ipados:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

Vendor references (8)

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

MITRE references (8) cveawg.mitre.org

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

Web references (7)

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 (8)

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 (17)

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

  • CVE-2026-8959 - Vulnerability Details - OpenCVE
    web:app.opencve.io

    A flaw in the Widget: Win32 component allows a malicious page to bypass the browser sandbox by exploiting incorrect boundary checks. This is an instance of buffer overrun and improper input validation (CWE-119) and insecure code path selection (CWE-693). The bug can lead to execution with higher privileges than the sandbox grants, potentially compromising the confidentiality, integrity, and ...

    2026-05-23 21:01 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 21:01 UTC
  • Guide Topic 9200
    web:guide.freddiemac.com

    The new, user friendly Seller/Servicer Guide will make it significantly easier for you and your team to find, understand and share critical information.

    2026-05-23 21:01 UTC
  • Patch Tuesday, May 2026 Edition - Krebs on Security
    web:krebsonsecurity.com

    Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.

    2026-05-23 21:01 UTC
  • Nvd - Cve-2026-8959
    web:nvd.nist.gov

    An official website of the United States government Here's how you know

    2026-05-23 21:01 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 21:01 UTC
  • ArcGIS Server Security 2025 Update 2 Patch - Esri Support
    web:support.esri.com

    Esri announces ArcGIS Server Security 2025 Update 2 Patch . Esri recommends that all customers using ArcGIS Server 11.5, 11.4, 11.3, 11.1 and 10.9.1 apply this patch . This patch deals specifically with the issues listed below under Issues addressed with this patch . This patch can be uninstalled as outlined in the Uninstalling this patch on Windows and Uninstalling this patch on Linux sections ...

    2026-05-23 21:01 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 21:01 UTC
  • Patch CVE-2023-23397 Immediately: What You Need To Know and Do
    web:www.trendmicro.com

    Update as of 03/22/3023 2:50PM PHT: Updated the prevention and mitigation section for an additional step. CVE -2023-23397 is a critical privilege elevation/authentication bypass vulnerability in Outlook, released as part of the March Patch Tuesday set of fixes.

    2026-05-23 21:01 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 21:01 UTC
  • Zero-Day Threat Report May 2026 - CVEs, Exploits & Remediation ...
    web:carthageelectronics.com

    Status: Actively exploited — CISA KEV listed — patch by May 12, 2026 What Happened On April 28, 2026 , CISA added CVE - 2026 -32202 to its Known Exploited Vulnerabilities (KEV) catalog with a federal remediation deadline of May 12, 2026 . This vulnerability is the result of an incomplete patch Microsoft released in February for CVE - 2026 -21510.

    2026-05-26 02:50 UTC
  • CVE-2026-8959 - Sandbox escape due to incorrect boundary conditions in ...
    web:cvefeed.io

    Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

    2026-05-26 02:50 UTC
  • Critical Microsoft Exchange Server Vulnerability Actively Exploited in ...
    web:cybersecuritynews.com

    Microsoft Exchange Server spoofing flaw, is being actively exploited against on-premises systems before a permanent patch is available.

    2026-05-26 02:50 UTC
  • Addressing Exchange Server May 2026 vulnerability CVE-2026-42897
    web:techcommunity.microsoft.com

    We wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE - 2026 -42897.

    2026-05-26 02:50 UTC
  • CVE-2026-42897 Exchange OWA Mitigation M2: What Admins Must Verify
    web:windowsforum.com

    Microsoft's Fastest Fix Is a Mitigation , Not a Patch The important detail in Microsoft's May 14 notice is that there is no permanent Exchange security update available yet for CVE - 2026 -42897. Microsoft says it is working on one and will release it later for affected supported paths, but today's defensive action is mitigation .

    2026-05-26 02:50 UTC
  • Microsoft Confirms Active 0-Day Exploit—Check Emergency Mitigation
    web:www.forbes.com

    Updated May 17: This article, originally published May 16, has been updated to include further details on the emergency mitigation process recommended after the CVE - 2026 -42897 Microsoft Exchange ...

    2026-05-26 02:50 UTC
  • CVE-2026-8959 - Critical Vulnerability - TheHackerWire
    web:www.thehackerwire.com

    CVE - 2026 -8959 is a Critical severity vulnerability (CVSS 9.6). Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox...

    2026-05-26 02:50 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-28959.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-28959",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-12T19:27:21.083038Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-120",
                "description": "CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-12T19:53:57.743Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "iOS and iPadOS",
          "vendor": "Apple",
          "versions": [
            {
              "lessThan": "18.7.9",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
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              "lessThan": "26.5",
              "status": "affected",
              "version": "0",
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            }
          ]
        },
        {
          "product": "macOS",
          "vendor": "Apple",
          "versions": [
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            },
            {
              "lessThan": "15.7.7",
              "status": "affected",
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          ]
        },
        {
          "product": "tvOS",
          "vendor": "Apple",
          "versions": [
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              "status": "affected",
              "version": "0",
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            }
          ]
        },
        {
          "product": "visionOS",
          "vendor": "Apple",
          "versions": [
            {
              "lessThan": "26.5",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "watchOS",
          "vendor": "Apple",
          "versions": [
            {
              "lessThan": "26.5",
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              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "An app may be able to cause unexpected system termination",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T20:07:29.263Z",
        "orgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
        "shortName": "apple"
      },
      "references": [
        {
          "url": "https://support.apple.com/en-us/127110"
        },
        {
          "url": "https://support.apple.com/en-us/127111"
        },
        {
          "url": "https://support.apple.com/en-us/127115"
        },
        {
          "url": "https://support.apple.com/en-us/127116"
        },
        {
          "url": "https://support.apple.com/en-us/127117"
        },
        {
          "url": "https://support.apple.com/en-us/127118"
        },
        {
          "url": "https://support.apple.com/en-us/127119"
        },
        {
          "url": "https://support.apple.com/en-us/127120"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
    "assignerShortName": "apple",
    "cveId": "CVE-2026-28959",
    "datePublished": "2026-05-11T20:07:29.263Z",
    "dateReserved": "2026-03-03T16:36:03.991Z",
    "dateUpdated": "2026-05-12T19:53:57.743Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}