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VULNERABILITIES

CVE-2026-42013 Details

Description

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:13274 [email protected]
https://access.redhat.com/errata/RHSA-2026:20611 [email protected]
https://access.redhat.com/errata/RHSA-2026:20612 [email protected]
https://access.redhat.com/errata/RHSA-2026:20613 [email protected]
https://access.redhat.com/errata/RHSA-2026:26319 [email protected]

see all 23 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-295Improper Certificate Validation[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

27 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-42013
NVD Published Date:
May 26, 2026
NVD Last Modified:
Sep 3, 2026
Source:
[email protected]
CVE-2026-42013 Details - Not Deferred