GnuTLS Vulnerability Advisory: CVE-2026-42012/42013/42014 Analysis and Patch

Vulnerability Overview This page summarizes multiple security vulnerabilities in the GnuTLS Transport Layer Security Library. These vulnerabilities encompass various types, including certificate misuse, privilege escalation/bypass, heap overflows, and memory corruption. Each vulnerability is associated with a specific CVE identifier and severity rating. Impact Scope Certificate Misuse: Several vulnerabilities involve issues during certificate verification, potentially leading to man-in-the-middle attacks or certificate bypasses. Privilege Bypass: Certain vulnerabilities allow attackers to bypass authentication mechanisms, gaining unauthorized access. Heap Overflow and Memory Corruption: These vulnerabilities can cause program crashes or be exploited to execute arbitrary code. Other Issues: Include name constraint bypasses and timing side-channel attacks. Remediation Version Upgrade: The primary remediation for most vulnerabilities is to upgrade to GnuTLS 3.8.13 or later. Specific Patches: Some vulnerabilities require the application of specific patches or configuration changes. Code Review: It is recommended to conduct a code review to ensure no similar vulnerabilities exist. Example Vulnerability Details Vulnerability 1: CVE-2026-42014 Description: Changing the Security Officer PIN results in a use-after-free vulnerability if the provided PIN is NULL. Severity: Medium Remediation: Upgrade to GnuTLS 3.8.13 or later. Vulnerability 2: CVE-2026-42013 Description: When verifying a certificate with an Extended Subject Alternative Name, if the DNS hostname in the certificate does not match the Common Name, it results in certificate misuse. Severity: Medium Remediation: Upgrade to GnuTLS 3.8.13 or later. Vulnerability 3: CVE-2026-42012 Description: When verifying a certificate containing URI or SRV Subject Alternative Names, if the DNS hostname in the certificate does not match the Common Name, it results in certificate misuse. Severity: Medium Remediation: Upgrade to GnuTLS 3.8.13 or later. Summary This page details multiple security vulnerabilities within the GnuTLS library, providing specific descriptions, severity ratings, and remediation steps for each. Users are advised to upgrade to the latest version as soon as possible to patch these vulnerabilities and ensure system security.

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GnuTLS Vulnerability Advisory: CVE-2026-42012/42013/42014 Analysis and Patch