Vulnerability-Lookup

rlsa-2026:36728

Vulnerability from osv_rocky

Published

2026-07-09 06:00

Modified

2026-07-23 06:09

Summary

Low: libtasn1 security update

Details

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 asn1_expend_octet_string (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.

Severity

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:36728	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2427698	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:8",
        "name": "libtasn1",
        "purl": "pkg:rpm/rocky-linux/libtasn1?distro=rocky-linux-8\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "BaseOS"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:4.13-6.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "details": "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.\n\nSecurity Fix(es):\n\n* libtasn1: libtasn1: Denial of Service via stack-based buffer overflow in asn1_expend_octet_string (CVE-2025-13151)\n\nFor 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.",
  "id": "RLSA-2026:36728",
  "modified": "2026-07-23T06:09:17.652304Z",
  "published": "2026-07-09T06:00:16.850158Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:36728"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427698"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Low: libtasn1 security update",
  "upstream": [
    "CVE-2025-13151"
  ]
}

CVE-2025-13151 (GCVE-0-2025-13151)

Vulnerability from cvelistv5 – Published: 2026-01-07 21:14 – Updated: 2026-01-20 17:08

Title

CVE-2025-13151

Summary

Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

Assigner

certcc

References

4 references

URL	Tags
https://gitlab.com/gnutls/libtasn1
https://gitlab.com/gnutls/libtasn1/-/merge_requests/121	patch
http://www.openwall.com/lists/oss-security/2026/01/08/5
https://www.kb.cert.org/vuls/id/271649

Impacted products

1 product

Vendor	Product	Version
GnuTLS	libtasn1	Affected: 0 , ≤ 4.20.0 (semver)

Credits

This issue was reported Benny Zelster from Microsoft Security Research

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-13151",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-07T21:32:59.782767Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-07T21:33:12.865Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-01-20T17:08:41.712Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/01/08/5"
          },
          {
            "url": "https://www.kb.cert.org/vuls/id/271649"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "libtasn1",
          "vendor": "GnuTLS",
          "versions": [
            {
              "lessThanOrEqual": "4.20.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was reported Benny Zelster from Microsoft Security Research"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
              "lang": "en"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "CWE-121 Stack-based Buffer Overflow",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-07T21:15:56.927Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "name": "Source Code Respoitory",
          "url": "https://gitlab.com/gnutls/libtasn1"
        },
        {
          "name": "Proposed Pull Request",
          "tags": [
            "patch"
          ],
          "url": "https://gitlab.com/gnutls/libtasn1/-/merge_requests/121"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "CVE-2025-13151",
      "x_generator": {
        "engine": "VINCE 3.0.31",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2025-13151"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2025-13151",
    "datePublished": "2026-01-07T21:14:05.223Z",
    "dateReserved": "2025-11-13T21:14:53.973Z",
    "dateUpdated": "2026-01-20T17:08:41.712Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

rlsa-2026:36728

Vulnerability from osv_rocky

CVE-2025-13151 (GCVE-0-2025-13151)

Tags

Sightings

Nomenclature