Red Hat Security Advisory: gnutls and libtasn1 security update
Multiple security vulnerabilities have been identified in the gnutls and libtasn1 packages used in Red Hat Enterprise Linux 8.4 variants. These issues include denial of service via inefficient DER decoding, excessive resource consumption, heap buffer overflows, authentication bypasses, certificate validation bypasses, information disclosure, use-after-free, and memory corruption. The vulnerabilities affect cryptographic protocols such as SSL, TLS, and DTLS implemented by GnuTLS. Red Hat has issued an important security advisory with updates addressing these flaws.
AI Analysis
Technical Summary
The gnutls packages provide the GNU Transport Layer Security library implementing SSL, TLS, and DTLS protocols. Several vulnerabilities were found including inefficient DER decoding in libtasn1 leading to potential remote denial of service (CVE-2024-12133), multiple denial of service vectors in gnutls (CVE-2025-14831, CVE-2026-33845, CVE-2026-33846, CVE-2026-42009), authentication bypass via NUL character in username (CVE-2026-42010), security and certificate validation bypasses due to improper handling of name constraints and SANs (CVE-2026-3833, CVE-2026-42011, CVE-2026-42012, CVE-2026-42013), information disclosure via heap overread in RSA key exchange (CVE-2026-5260), use-after-free and memory corruption bugs (CVE-2026-42014, CVE-2026-42015). Red Hat has issued an important security advisory (RHSA-2026:30850) with updates for Red Hat Enterprise Linux 8.8 to address these issues.
Potential Impact
The vulnerabilities collectively allow for denial of service attacks through resource exhaustion and memory corruption, authentication bypasses, security policy bypasses, certificate validation bypasses, and potential information disclosure. These issues could undermine the security guarantees of TLS/DTLS communications on affected systems, potentially allowing attackers to disrupt services or bypass authentication and validation mechanisms.
Mitigation Recommendations
Red Hat has released security updates for the gnutls and libtasn1 packages in Red Hat Enterprise Linux 8.8 to address these vulnerabilities. Users should apply the updates provided in advisory RHSA-2026:30850 promptly to remediate these issues. For update instructions and package details, refer to https://access.redhat.com/articles/11258. Patch status is confirmed as official-fix by Red Hat.
Red Hat Security Advisory: gnutls and libtasn1 security update
Description
Multiple security vulnerabilities have been identified in the gnutls and libtasn1 packages used in Red Hat Enterprise Linux 8.4 variants. These issues include denial of service via inefficient DER decoding, excessive resource consumption, heap buffer overflows, authentication bypasses, certificate validation bypasses, information disclosure, use-after-free, and memory corruption. The vulnerabilities affect cryptographic protocols such as SSL, TLS, and DTLS implemented by GnuTLS. Red Hat has issued an important security advisory with updates addressing these flaws.
CVSS v3.1
Score 5.3medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The gnutls packages provide the GNU Transport Layer Security library implementing SSL, TLS, and DTLS protocols. Several vulnerabilities were found including inefficient DER decoding in libtasn1 leading to potential remote denial of service (CVE-2024-12133), multiple denial of service vectors in gnutls (CVE-2025-14831, CVE-2026-33845, CVE-2026-33846, CVE-2026-42009), authentication bypass via NUL character in username (CVE-2026-42010), security and certificate validation bypasses due to improper handling of name constraints and SANs (CVE-2026-3833, CVE-2026-42011, CVE-2026-42012, CVE-2026-42013), information disclosure via heap overread in RSA key exchange (CVE-2026-5260), use-after-free and memory corruption bugs (CVE-2026-42014, CVE-2026-42015). Red Hat has issued an important security advisory (RHSA-2026:30850) with updates for Red Hat Enterprise Linux 8.8 to address these issues.
Potential Impact
The vulnerabilities collectively allow for denial of service attacks through resource exhaustion and memory corruption, authentication bypasses, security policy bypasses, certificate validation bypasses, and potential information disclosure. These issues could undermine the security guarantees of TLS/DTLS communications on affected systems, potentially allowing attackers to disrupt services or bypass authentication and validation mechanisms.
Mitigation Recommendations
Red Hat has released security updates for the gnutls and libtasn1 packages in Red Hat Enterprise Linux 8.8 to address these vulnerabilities. Users should apply the updates provided in advisory RHSA-2026:30850 promptly to remediate these issues. For update instructions and package details, refer to https://access.redhat.com/articles/11258. Patch status is confirmed as official-fix by Red Hat.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:17347
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- 3.1
Threat ID: 6a1f4e87e29bf47b50081646
Added to database: 06/02/2026, 21:43:35 UTC
Last enriched: 07/23/2026, 00:47:26 UTC
Last updated: 07/31/2026, 19:22:51 UTC
Views: 63
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