SB20260819146 - Red Hat Enterprise Linux 10 update for yggdrasil

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Main Vulnerability Database SB20260819146

SB20260819146 - Red Hat Enterprise Linux 10 update for yggdrasil

Published: August 19, 2026

Security Bulletin ID SB20260819146
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Certificate Validation (CVE-ID: CVE-2026-33810)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass certificate name constraints.

The vulnerability exists due to improper certificate validation in the Certificate.Verify function in crypto/x509 when verifying a certificate chain containing excluded DNS constraints and wildcard DNS SANs that use different letter case than the constraint. A remote attacker can present a specially crafted certificate chain to bypass certificate name constraints.

This only affects validation of otherwise trusted certificate chains issued by a root CA in the VerifyOptions.Roots CertPool or in the system certificate pool.


Remediation

Install update from vendor's website.

References