RHSA-2026:33125: Important: gnutls and libtasn1 security update

Published Jun 29, 2026
·
Updated

Important: gnutls and libtasn1 security update

Other sources

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): libtasn1: Inefficient DER Decoding in libtasn1 Leading to Potential Remote DoS (CVE-2024-12133) gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification (CVE-2025-14831) 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 gnutlspkcs11tokensetpin (CVE-2026-42014) gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling (CVE-2026-42015) 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.

— Red Hat

Affected Software

28 affected componentsFixes available
Red Hat Red Hat Enterprise Linux Server - AUS
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension
redhat/gnutls<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/libtasn1<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/gnutls<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-dane<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-dane<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-dane-debuginfo<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-dane-debuginfo<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-debuginfo<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-debuginfo<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-debugsource<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-debugsource<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-devel<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-devel<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-utils<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-utils-debuginfo<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/gnutls-utils-debuginfo<3.6.14-10.el8_4.1
3.6.14-10.el8_4.1
redhat/libtasn1<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-debuginfo<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-debuginfo<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-debugsource<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-debugsource<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-devel<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-devel<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-tools<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-tools-debuginfo<4.13-3.el8_4.1
4.13-3.el8_4.1
redhat/libtasn1-tools-debuginfo<4.13-3.el8_4.1
4.13-3.el8_4.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/gnutls to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  2. Upgrade

    Upgrade redhat/libtasn1 to a version that resolves this vulnerability.

    Fixed in 4.13-3.el8_4.1
  3. Upgrade

    Upgrade redhat/gnutls-dane to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  4. Upgrade

    Upgrade redhat/gnutls-dane-debuginfo to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  5. Upgrade

    Upgrade redhat/gnutls-debuginfo to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  6. Upgrade

    Upgrade redhat/gnutls-debugsource to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  7. Upgrade

    Upgrade redhat/gnutls-devel to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  8. Upgrade

    Upgrade redhat/gnutls-utils to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  9. Upgrade

    Upgrade redhat/gnutls-utils-debuginfo to a version that resolves this vulnerability.

    Fixed in 3.6.14-10.el8_4.1
  10. Upgrade

    Upgrade redhat/libtasn1-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.13-3.el8_4.1
  11. Upgrade

    Upgrade redhat/libtasn1-debugsource to a version that resolves this vulnerability.

    Fixed in 4.13-3.el8_4.1
  12. Upgrade

    Upgrade redhat/libtasn1-devel to a version that resolves this vulnerability.

    Fixed in 4.13-3.el8_4.1
  13. Upgrade

    Upgrade redhat/libtasn1-tools to a version that resolves this vulnerability.

    Fixed in 4.13-3.el8_4.1
  14. Upgrade

    Upgrade redhat/libtasn1-tools-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.13-3.el8_4.1

Event History

Jun 29, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·02:41 PM
Data Sourced
via Red Hat·02:41 PM
Severity

Frequently Asked Questions

1

What is the severity of RHSA-2026:33125?

The severity of RHSA-2026:33125 is high with a score of 7.

2

How do I fix RHSA-2026:33125?

To fix RHSA-2026:33125, update the gnutls and libtasn1 packages to their latest versions.

3

What vulnerabilities are addressed in RHSA-2026:33125?

RHSA-2026:33125 addresses inefficient DER decoding issues in libtasn1 that can lead to potential remote code execution.

4

Which packages are affected by RHSA-2026:33125?

The affected packages include redhat/gnutls, redhat/libtasn1, and their associated debuginfo and development packages.

5

What security risks are associated with RHSA-2026:33125?

The security risks associated with RHSA-2026:33125 include buffer overflow and use after free vulnerabilities.

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