RHSA-2026:30004 — Security Advisory

An update for gnutls is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Security Fix(es):

• gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison (CVE-2026-3833)

• gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment (CVE-2026-33845)

• gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly (CVE-2026-33846)

• gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)

• gnutls: gnutls: Authentication Bypass via NUL Character in Username (CVE-2026-42010)

• gnutls: gnutls: Security bypass due to incorrect name constraint handling (CVE-2026-42011)

• gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs (CVE-2026-42012)

• gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name (CVE-2026-42013)

• gnutls: gnutls: Information disclosure via heap overread in RSA key exchange (CVE-2026-5260)

• gnutls: Fix use-after-free in gnutls_pkcs11_token_set_pin (CVE-2026-42014)

• gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling (CVE-2026-42015)

• guntls: gnutls: Information disclosure via timing side-channel in PKCS#7 padding removal (CVE-2026-5419)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.