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CVE-2026-42012

📛 CVE Title

Debian: CVE-2026-42012: gnutls28 -- security update

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Description

Debian: CVE-2026-42012: gnutls28 -- security update

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-42012 on 2026-07-07. Shown when MITRE's text differs from the cvelistV5 mirror.

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.

Overview

State
—
Assigner (CNA)
—
CVSS severity
high
CVSS score
CVSS 7.1 / 10 7.1 7.1 / 10
CVSS vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
Effective score
7.1 / 10 HIGH source: CNA overview
MSRC score
7.1 / 10 HIGH MS rating: Important
CWE(s)
CWE-295
Reserved
—
Published
2026-05-20 00:00 UTC
Last updated
2026-06-19 14:40 UTC
Source
https://www.rapid7.com/db/vulnerabilities/debian-cve-2026-42012/
Linked Threat
CVE-2026-42012 — CVE-2026-42012

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
2026-05-26 22:16:41 UTC
NVD last modified
2026-06-30 03:19:30 UTC
NVD CVSS v3.1
CVSS 7.1 / 10 7.1 7.1 / 10 HIGH source: secalert@redhat.com
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Exploitability subscore
2.8 / 10
Impact subscore
4.2 / 10
EPSS score
0.0035 (probability of exploitation in next 30 days)
EPSS percentile
27.42% vs all CVEs — higher = more likely to be exploited, as of 2026-07-06

NVD / KEV / EPSS data refreshed 2026-07-07 01:06 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-2026-32010
Assigner
redhat
Published
May 26, 2026, 9:29:26 PM
Updated
Jul 22, 2026, 3:07:50 PM
EUVD base score (CVSS 3.1)
7.1 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
EUVD-reported EPSS
0.3500
Vendors
Red Hat
Products
Red Hat Discovery 2 (patch: 1782166952)
Red Hat Enterprise Linux 8.8 Telecommunications Update Service (patch: 0:3.6.16-7.el8_8.4)
Red Hat Update Infrastructure 5 (patch: 1781525739)
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (patch: 0:3.6.16-7.el8_8.4)
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (patch: 0:4.13-3.el8_6.2)
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (patch: 0:3.7.6-21.el9_2.7)
Red Hat Enterprise Linux 7 Extended Lifecycle Support (patch: 0:3.3.29-9.el7_9.2)
Red Hat Discovery 2 (patch: 1782159791)
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (patch: 0:3.8.3-4.el9_4.6)
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (patch: 0:4.13-4.el8_8.1)
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (patch: 0:3.6.14-10.el8_4.1)
Red Hat Update Infrastructure 5 (patch: 1781525684)
Red Hat Enterprise Linux 10.0 Extended Update Support (patch: 0:3.8.9-9.el10_0.19)
Red Hat Enterprise Linux 9 (patch: 0:3.8.10-4.el9_8)
Red Hat Hardened Images (patch: 3.8.13-1.hum1)
Red Hat Enterprise Linux 10 (patch: 0:3.8.10-4.el10_2)
Red Hat Enterprise Linux 8.8 Telecommunications Update Service (patch: 0:4.13-4.el8_8.1)
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (patch: 0:4.13-3.el8_4.1)
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (patch: 0:3.6.16-5.el8_6.5)
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (patch: 0:4.13-3.el8_4.1)
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (patch: 0:3.6.14-10.el8_4.1)
Red Hat Update Infrastructure 5 (patch: 1781525693)
Red Hat Update Infrastructure 5 (patch: 1781525671)
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (patch: 0:3.6.16-5.el8_6.5)
Red Hat Enterprise Linux 8 (patch: 0:3.6.16-8.el8_10.6)
Red Hat Enterprise Linux 9.6 Extended Update Support (patch: 0:3.8.3-6.el9_6.4)
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (patch: 0:4.13-3.el8_6.2)
Aliases
GHSA-7hhj-8fwv-m5hc

ENISA description: A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.

EUVD references (17)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-09-25 03:07 UTC (source: CVRF).

MS severity
Important
MS CVSS base score
7.1 / 10 (temporal 7.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Release
2026-May
Microsoft remediations / KB articles (2)

Vendor references (0)

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

None in the CVE record.

MITRE references (9) cveawg.mitre.org

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

Web references (11)

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 (14)

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.

  • 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.

    2026-06-04 08:43 UTC
  • N-central third-party software patch list
    web:documentation.n-able.com

    N-central third-party software patch list The table below lists the third party patches available through Patch Management. The Windows agent communicates with the probe to determine what third-party applications can be updated. The agent obtains a list of applications from the probe and compares it to the software installed on a device. The agent determines what applications on a device need ...

    2026-06-04 08:43 UTC
  • Microsoft's May 2026 Patch Tuesday - Hive Pro
    web:hivepro.com

    Microsoft Patch Tuesday Overview and Vulnerability Distribution Microsoft's May 2026 Patch Tuesday delivers a comprehensive security update addressing 137 Microsoft vulnerabilities across the product ecosystem.

    2026-06-04 08:43 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 ...

    2026-06-04 08:43 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.

    2026-06-04 08:43 UTC
  • Microsoft May 2026 Patch Tuesday Fixes 120 Flaws
    web:thecyberexpress.com

    Microsoft has rolled out its May 2026 Patch Tuesday security updates, delivering fixes for approximately 120 vulnerabilities across Windows, Microsoft Office, networking services, and enterprise platforms.

    2026-06-04 08:43 UTC
  • Critical Patches Issued for Microsoft Products, May 12, 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 ...

    2026-06-04 08:43 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.

    2026-06-04 08:43 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.

    2026-06-04 08:43 UTC
  • Patch Tuesday June 2026: Security Updates & CVE Analysis
    web:zecurit.com

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

    2026-06-04 08:43 UTC
  • April 2026 Critical Patch Update Released | security - Oracle Blogs
    web:blogs.oracle.com

    For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

    2026-06-19 02:26 UTC
  • Nvd - Cve-2026-26012
    web:nvd.nist.gov

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

    2026-06-19 02:26 UTC
  • CVE-2026-42012 - security-tracker.debian.org
    web:security-tracker.debian.org

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

    2026-06-19 02:26 UTC
  • CVE-2026-42012 - vulnerability database | Vulners.com
    web:vulners.com

    CVE-2026-42012 affects the GnuTLS library. A remote attacker can craft a certificate with URI or SRV SANs that causes the validator to fall back to CN checks, bypassing proper SAN validation and enabling potential impersonation/MITM. Documented in...

    2026-06-19 02:26 UTC
  • CVE-2026-42012: GnuTLS TLS Cert Validation Bypass and Why Windows Must ...
    web:windowsforum.com

    The Certificate Bug That Teaches a Windows Lesson CVE-2026-42012 is a good test of whether an organization's security process understands the systems it actually runs. The remediation is not conceptually hard, but it cuts across packaging, ownership, and assumptions about where risk lives.

    2026-06-19 02:26 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 ...

    2026-06-19 02:26 UTC
  • Microsoft Technical Security Notifications
    web:www.microsoft.com

    Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.

    2026-06-19 02:26 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-42012.json.

Not stored.