RHSA-2026:36728: Low: libtasn1 security update

Published Jul 8, 2026
·
Updated

A library that provides Abstract Syntax Notation One (ASN.1, as specified by the X.680 ITU-T recommendation) parsing and structures management, and Distinguished Encoding Rules (DER, as per X.690) encoding and decoding functions.Security Fix(es): libtasn1: libtasn1: Denial of Service via stack-based buffer overflow in asn1expendoctetstring (CVE-2025-13151) 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.

Affected Software

32 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for Power, little endian
Red Hat Red Hat Enterprise Linux for IBM z Systems
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64
redhat/libtasn1<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-debuginfo<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-debuginfo<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-debugsource<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-debugsource<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-devel<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-devel<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-tools<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-tools-debuginfo<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-tools-debuginfo<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-tools<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-debuginfo<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-debugsource<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-devel<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-tools<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1-tools-debuginfo<4.13-6.el8_10
4.13-6.el8_10
redhat/libtasn1<4.13-6.el8_10.aa
4.13-6.el8_10.aa
redhat/libtasn1-debuginfo<4.13-6.el8_10.aa
4.13-6.el8_10.aa
redhat/libtasn1-debugsource<4.13-6.el8_10.aa
4.13-6.el8_10.aa
redhat/libtasn1-devel<4.13-6.el8_10.aa
4.13-6.el8_10.aa
redhat/libtasn1-tools<4.13-6.el8_10.aa
4.13-6.el8_10.aa
redhat/libtasn1-tools-debuginfo<4.13-6.el8_10.aa
4.13-6.el8_10.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 4.13-6.el8_10
  2. Upgrade

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

    Fixed in 4.13-6.el8_10
  3. Upgrade

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

    Fixed in 4.13-6.el8_10
  4. Upgrade

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

    Fixed in 4.13-6.el8_10
  5. Upgrade

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

    Fixed in 4.13-6.el8_10
  6. Upgrade

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

    Fixed in 4.13-6.el8_10
  7. Upgrade

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

    Fixed in 4.13-6.el8_10.aa
  8. Upgrade

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

    Fixed in 4.13-6.el8_10.aa
  9. Upgrade

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

    Fixed in 4.13-6.el8_10.aa
  10. Upgrade

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

    Fixed in 4.13-6.el8_10.aa
  11. Upgrade

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

    Fixed in 4.13-6.el8_10.aa
  12. Upgrade

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

    Fixed in 4.13-6.el8_10.aa

Event History

Jul 8, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·11:52 AM
Data Sourced
via Red Hat·11:52 AM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:36728?

The severity of RHSA-2026:36728 is rated as low.

2

What does RHSA-2026:36728 address?

RHSA-2026:36728 addresses a security update for the libtasn1 library.

3

How do I fix RHSA-2026:36728?

To fix RHSA-2026:36728, apply the security update provided by Red Hat for your specific system architecture.

4

Which software is affected by RHSA-2026:36728?

RHSA-2026:36728 affects various versions of Red Hat Enterprise Linux across multiple architectures, including IBM z Systems, x86_64, Power, and ARM.

5

When was RHSA-2026:36728 published?

RHSA-2026:36728 was published on July 8, 2026.

Company

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RHSA-2026:36728 - Low: libtasn1 security update - SecAlerts