RHSA-2026:7500

Vulnerability from csaf_redhat - Published: 2026-04-10 20:46 - Updated: 2026-04-20 21:33
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Low
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: libtasn1: * libtasn1-4.21.0-1.1.hum1 (aarch64, x86_64) * libtasn1-devel-4.21.0-1.1.hum1 (aarch64, x86_64) * libtasn1-tools-4.21.0-1.1.hum1 (aarch64, x86_64) * libtasn1-4.21.0-1.1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2025-13151

A flaw was found in libtasn1. A remote attacker could exploit a stack-based buffer overflow vulnerability in the `asn1_expend_octet_string` function. This occurs due to a failure in validating the size of input data. Successful exploitation can lead to a Denial of Service (DoS) condition, making the affected system or application unavailable.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:7500
Workaround Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
References
To clipboard 

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        "text": "This update includes the following RPMs:\n\nlibtasn1:\n  * libtasn1-4.21.0-1.1.hum1 (aarch64, x86_64)\n  * libtasn1-devel-4.21.0-1.1.hum1 (aarch64, x86_64)\n  * libtasn1-tools-4.21.0-1.1.hum1 (aarch64, x86_64)\n  * libtasn1-4.21.0-1.1.hum1.src (src)",
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        "name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
      },
      "discovery_date": "2026-01-07T22:01:02.206250+00:00",
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          "category": "description",
          "text": "A flaw was found in libtasn1. A remote attacker could exploit a stack-based buffer overflow vulnerability in the `asn1_expend_octet_string` function. This occurs due to a failure in validating the size of input data. Successful exploitation can lead to a Denial of Service (DoS) condition, making the affected system or application unavailable.",
          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated Low for Red Hat products. A stack-based buffer overflow in the `libtasn1` library, specifically within the `asn1_expend_octet_string` function, can be triggered by failing to validate input data size. This could allow a remote, unauthenticated attacker to cause a denial of service in applications utilizing `libtasn1`.",
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          "summary": "https://gitlab.com/gnutls/libtasn1/-/merge_requests/121",
          "url": "https://gitlab.com/gnutls/libtasn1/-/merge_requests/121"
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      "release_date": "2026-01-07T21:14:05.223000+00:00",
      "remediations": [
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          "date": "2026-04-10T20:46:25+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:libtasn1-main@aarch64",
            "Red Hat Hardened Images:libtasn1-main@src",
            "Red Hat Hardened Images:libtasn1-main@x86_64"
          ],
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            "category": "none"
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        },
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          "product_ids": [
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            "Red Hat Hardened Images:libtasn1-main@src",
            "Red Hat Hardened Images:libtasn1-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:libtasn1-main@aarch64",
            "Red Hat Hardened Images:libtasn1-main@src",
            "Red Hat Hardened Images:libtasn1-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "libtasn1: libtasn1: Denial of Service via stack-based buffer overflow in asn1_expend_octet_string"
    }
  ]
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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