SB2026083109 - Red Hat Enterprise Linux 10 update for rhc

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Main Vulnerability Database SB2026083109

SB2026083109 - Red Hat Enterprise Linux 10 update for rhc

Published: August 31, 2026

Security Bulletin ID SB2026083109
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


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.


2) Double free (CVE-ID: CVE-2026-33811)

CWE-ID: CWE-415 - Double Free

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to double free in net.LookupCNAME and Resolver.LookupCNAME when processing a very long CNAME response with the cgo DNS resolver. A remote attacker can send a specially crafted DNS response to cause a denial of service.


Remediation

Install update from vendor's website.

References