GnuTLS security vulnerabilities

GnuTLS is an open-source, free security communication library developed by GnuTLS that enables the implementation of SSL, TLS, and DTLS protocols. There is a security vulnerability in gnutls, which stems from the fact that the PKCS7 padding check does not occur at a constant time during decryptio...

gnutls: gnutls: Security bypass due to incorrect name constraint handling

A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities CAs only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate...

Astra Linux - уязвимость в gnutls28

A flaw was discovered in GnuTLS, which relies on libtasn1 for ASN.1 data processing. Due to an inefficient algorithm in libtasn1, decoding certain DER-encoded certificate data can take excessive time, leading to increased resource consumption. This flaw allows a remote attacker to send a speciall...

Undefined Behavior for Input to API

Overview Affected versions of this package are vulnerable to Undefined Behavior for Input to API in the comparator function responsible for ordering Datagram Transport Layer Security DTLS packets by sequence numbers. An attacker can cause unstable packet ordering or undefined behavior by sending...

EUVD-2026-28386

A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities CAs only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate...

Improper Certificate Validation

Overview Affected versions of this package are vulnerable to Improper Certificate Validation via incorrect handling of name constraints during certificate validation. An attacker can bypass critical certificate validation checks by presenting a certificate chain where permitted name constraints a...

EUVD-2026-28354

A flaw was found in gnutls. Servers configured with RSA-PSK Rivest–Shamir–Adleman – Pre-Shared Key wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass...

CVE-2026-42010

A flaw was found in gnutls. Servers configured with RSA-PSK Rivest–Shamir–Adleman – Pre-Shared Key wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass...

GnuTLS 信任管理问题漏洞

GnuTLS is an open-source, free security communication library developed by GnuTLS. GnuTLS has a trust management vulnerability. This vulnerability arises when the previous certificate issuer only had exclusion from name constraints, and the allowed name constraints were incorrectly ignored. This...

Important: Red Hat Security Advisory: updated RHEL-8 based Middleware Containers container images

Updated RHEL-8 based Middleware Containers container images are now available The RHEL-8 based Middleware Containers container images have been updated to address the following security advisory: RHSA-2026:11077 RHSA-2026:7667 RHSA-2026:8534 RHSA-2026:9745 see References Security Fixes: rsync:...

Astra Linux - уязвимость в gnutls28

A vulnerability was identified: the response times for malformed ciphertexts in RSA-PSK ClientKeyExchange differ from those of ciphertexts with correct PKCS1 v1.5 padding...

Slackware Linux 15.0 / current gnutls Vulnerability (SSA:2026-122-02)

The version of gnutls installed on the remote host is prior to 3.8.13. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-122-02 advisory. New gnutls packages are available for Slackware 15.0 and -current to fix a security issue. Tenable has extracted the preceding...

ALPINE-CVE-2026-3833

A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of nameConstraints labels, specifically for dNSName DNS or rfc822Name email constraints within excludedSubtrees or permittedSubtrees. A remote attacker can exploit this by crafting a leaf...

CVE-2026-3832

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol OCSP response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabl...

CVE-2026-3833

A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of nameConstraints labels, specifically for dNSName DNS or rfc822Name email constraints within excludedSubtrees or permittedSubtrees. A remote attacker can exploit this by crafting a leaf...

CVE-2026-1584

A flaw was found in gnutls. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted ClientHello message with an invalid Pre-Shared Key PSK binder value during the TLS handshake. This can lead to a NULL pointer dereference, causing the server to crash and...

RockyLinux 8 : gnutls (RLSA-2026:5585)

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:5585 advisory. gnutls: Stack-based Buffer Overflow in gnutlspkcs11tokeninit Function CVE-2025-9820 gnutls: GnuTLS: Denial of Service via excessive resource consumption...

RHEL 9 : gnutls (RHSA-2026:6630)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:6630 advisory. The gnutls packages provide the GNU Transport Layer Security GnuTLS library, which implements cryptographic algorithms and protocols such as SSL, TLS...

openSUSE 16 Security Update : gnutls (openSUSE-SU-2026:20446-1)

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20446-1 advisory. - CVE-2025-14831: Fixed DoS via excessive resource consumption during certificate verification. bsc1257960 - CVE-2025-9820: Fixed a buffer...

Amazon Linux 2023 : gnutls, gnutls-c++, gnutls-dane (ALAS2023-2026-1529)

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1529 advisory. A flaw was found in GnuTLS. This vulnerability allows a denial of service DoS by excessive CPU Central Processing Unit and memory consumption via specially crafted malicious certificates containing a...