RHSA-2026:30849: 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 for x86_64 - Extended Update Support Extension
Red Hat Red Hat Enterprise Linux Server - AUS
redhat/gnutls<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/libtasn1<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/gnutls<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-dane<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-dane<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-dane-debuginfo<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-dane-debuginfo<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-debuginfo<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-debuginfo<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-debugsource<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-debugsource<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-devel<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-devel<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-utils<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-utils-debuginfo<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/gnutls-utils-debuginfo<3.6.16-5.el8_6.5
3.6.16-5.el8_6.5
redhat/libtasn1<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-debuginfo<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-debuginfo<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-debugsource<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-debugsource<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-devel<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-devel<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-tools<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-tools-debuginfo<4.13-3.el8_6.2
4.13-3.el8_6.2
redhat/libtasn1-tools-debuginfo<4.13-3.el8_6.2
4.13-3.el8_6.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  2. Upgrade

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

    Fixed in 4.13-3.el8_6.2
  3. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  4. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  5. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  6. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  7. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  8. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  9. Upgrade

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

    Fixed in 3.6.16-5.el8_6.5
  10. Upgrade

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

    Fixed in 4.13-3.el8_6.2
  11. Upgrade

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

    Fixed in 4.13-3.el8_6.2
  12. Upgrade

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

    Fixed in 4.13-3.el8_6.2
  13. Upgrade

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

    Fixed in 4.13-3.el8_6.2
  14. Upgrade

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

    Fixed in 4.13-3.el8_6.2
  15. Compensating control

    Update gnutls and libtasn1 security packages: for gnutls include fixes for CVE-2026-42009, CVE-2026-42014, CVE-2026-33845, CVE-2025-14831, CVE-2026-33846, CVE-2026-3833, CVE-2026-42010, CVE-2026-42012, CVE-2026-42013, CVE-2026-5260, CVE-2026-42015, CVE-2026-42011; and for libtasn1 include fix for CVE-2024-12133 (inefficient DER decoding leading to potential remote DoS).

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·01:05 AM
Data Sourced
via Red Hat·01:05 AM
Severity
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of RHSA-2026:30849?

The severity of RHSA-2026:30849 is rated as high with a score of 7.

2

How do I fix RHSA-2026:30849?

To fix RHSA-2026:30849, you need to update the gnutls and libtasn1 packages to the latest versions provided by Red Hat.

3

What vulnerabilities are addressed in RHSA-2026:30849?

RHSA-2026:30849 addresses vulnerabilities related to inefficient DER decoding in libtasn1 that could lead to potential remote code execution.

4

Which software packages are affected by RHSA-2026:30849?

The affected software packages include redhat/gnutls and redhat/libtasn1 among others.

5

Is there a risk associated with RHSA-2026:30849?

Yes, there is a high risk associated with RHSA-2026:30849 due to potential security flaws in the cryptographic libraries used.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203
RHSA-2026:30849 - Important: gnutls and libtasn1 security update - SecAlerts