GnuTLS Library Multiple Vulnerabilities Advisory (Auth Bypass/Memory Corruption/DoS)

Vulnerability Overview The GnuTLS Transport Layer Security Library contains multiple security vulnerabilities affecting certificate verification, memory management, and protocol implementation. These vulnerabilities may lead to authentication bypass, memory corruption, denial of service, and other issues. Affected Scope Certificate Verification Issues: Multiple vulnerabilities (e.g., CVE-2026-42014, CVE-2026-42013, CVE-2026-42012, CVE-2026-42011, CVE-2026-3833, CVE-2026-42010, CVE-2026-33845, CVE-2026-42009, CVE-2026-5419, CVE-2026-3832, CVE-2026-42015, CVE-2026-5260, CVE-2026-33846, CVE-2025-14831, CVE-2025-1584, CVE-2025-9820, CVE-2025-6395, CVE-2025-32990, CVE-2025-32988, CVE-2025-32989, CVE-2024-12243, CVE-2024-28835, CVE-2024-0553, CVE-2024-0567, CVE-2024-28834, CVE-2023-5981, CVE-2022-2509, CVE-2021-0127, CVE-2021-20231, CVE-2021-20232, CVE-2020-24659, CVE-2023-0361, CVE-2020-13777, CVE-2020-11501, CVE-2019-3836, CVE-2019-3829, CVE-2017-7507, CVE-2017-5335, CVE-2017-5336, CVE-2017-5337, CVE-2017-5334, CVE-2015-3308, CVE-2014-0092, CVE-2009-2730, CVE-2008-2377, CERT-FI announcement, CVE-2008-1948, CVE-2008-1949, CVE-2008-1950, CVE-2005-0645) affect the certificate verification process, potentially leading to authentication bypass or certificate verification failure. Memory Management Issues: Multiple vulnerabilities (e.g., CVE-2026-42010, CVE-2026-33845, CVE-2026-42009, CVE-2026-5419, CVE-2026-3832, CVE-2026-42015, CVE-2026-5260, CVE-2026-33846, CVE-2025-14831, CVE-2025-1584, CVE-2025-9820, CVE-2025-6395, CVE-2025-32990, CVE-2025-32988, CVE-2025-32989, CVE-2024-12243, CVE-2024-28835, CVE-2024-0553, CVE-2024-0567, CVE-2024-28834, CVE-2023-5981, CVE-2022-2509, CVE-2021-0127, CVE-2021-20231, CVE-2021-20232, CVE-2020-24659, CVE-2023-0361, CVE-2020-13777, CVE-2020-11501, CVE-2019-3836, CVE-2019-3829, CVE-2017-7507, CVE-2017-5335, CVE-2017-5336, CVE-2017-5337, CVE-2017-5334, CVE-2015-3308, CVE-2014-0092, CVE-2009-2730, CVE-2008-2377, CERT-FI announcement, CVE-2008-1948, CVE-2008-1949, CVE-2008-1950, CVE-2005-0645) involve memory management, potentially leading to memory corruption or overflows. Protocol Implementation Issues: Multiple vulnerabilities (e.g., CVE-2026-42014, CVE-2026-42013, CVE-2026-42012, CVE-2026-42011, CVE-2026-3833, CVE-2026-42010, CVE-2026-33845, CVE-2026-42009, CVE-2026-5419, CVE-2026-3832, CVE-2026-42015, CVE-2026-5260, CVE-2026-33846, CVE-2025-14831, CVE-2025-1584, CVE-2025-9820, CVE-2025-6395, CVE-2025-32990, CVE-2025-32988, CVE-2025-32989, CVE-2024-12243, CVE-2024-28835, CVE-2024-0553, CVE-2024-0567, CVE-2024-28834, CVE-2023-5981, CVE-2022-2509, CVE-2021-0127, CVE-2021-20231, CVE-2021-20232, CVE-2020-24659, CVE-2023-0361, CVE-2020-13777, CVE-2020-11501, CVE-2019-3836, CVE-2019-3829, CVE-2017-7507, CVE-2017-5335, CVE-2017-5336, CVE-2017-5337, CVE-2017-5334, CVE-2015-3308, CVE-2014-0092, CVE-2009-2730, CVE-2008-2377, CERT-FI announcement, CVE-2008-1948, CVE-2008-1949, CVE-2008-1950, CVE-2005-0645) involve TLS/DTLS protocol implementation, potentially leading to protocol vulnerabilities. Remediation Upgrade GnuTLS Version: It is recommended to upgrade to GnuTLS version 3.8.13 or higher for most vulnerabilities. Refer to individual vulnerability descriptions for specific version requirements. Apply Patches: Some vulnerabilities require applying specific patches. For example, CVE-2020-13777 and CVE-2020-11501 require upgrading to GnuTLS 3.6.14 or 3.6.13. Use Libtasn1: For CVE-2005-0645, it is recommended to use Libtasn1 0.2.18 along with GnuTLS 1.2.10 (stable release) or 1.3.4 (experimental release). POC Code or Exploit Code No specific POC code or exploit code was provided in the page. Summary The GnuTLS Transport Layer Security Library contains multiple security vulnerabilities affecting certificate verification, memory management, and protocol implementation. Users are advised to upgrade to the recommended GnuTLS version or apply the corresponding patches as soon as possible to remediate these vulnerabilities.

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GnuTLS Library Multiple Vulnerabilities Advisory (Auth Bypass/Memory Corruption/DoS)