UBUNTU-CVE-2026-88340 (CVE-2026-88340)

Vulnerability from osv_ubuntu – Published: 2026-09-22 20:17 – Updated: 2026-10-17 09:54 – Source website
VLAI
Details

An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files. The vulnerability is caused by insufficient validation of external-variable pointers, which may lead to invalid free in yr_rules_destroy() or wild pointer access in yr_object_create(). An attacker can provide a specially crafted .yrc file that causes memory corruption and application crash.

Severity
7.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyara3",
            "binary_version": "3.4.0+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "python-yara",
            "binary_version": "3.4.0+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "python3-yara",
            "binary_version": "3.4.0+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "yara",
            "binary_version": "3.4.0+dfsg-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "yara",
        "purl": "pkg:deb/ubuntu/yara@3.4.0+dfsg-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.0+dfsg-2",
        "3.4.0+dfsg-2build1",
        "3.4.0+dfsg-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyara3",
            "binary_version": "3.7.1-1ubuntu2+esm1"
          },
          {
            "binary_name": "yara",
            "binary_version": "3.7.1-1ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "yara",
        "purl": "pkg:deb/ubuntu/yara@3.7.1-1ubuntu2+esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.6.3+dfsg-1ubuntu1",
        "3.7.1-1ubuntu1",
        "3.7.1-1ubuntu2",
        "3.7.1-1ubuntu2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyara3",
            "binary_version": "3.9.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "yara",
            "binary_version": "3.9.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "yara",
        "purl": "pkg:deb/ubuntu/yara@3.9.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.9.0-1",
        "3.9.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyara8",
            "binary_version": "4.1.3-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "yara",
            "binary_version": "4.1.3-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "yara",
        "purl": "pkg:deb/ubuntu/yara@4.1.3-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.0-1",
        "4.1.3-1",
        "4.1.3-1build1",
        "4.1.3-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyara10",
            "binary_version": "4.5.0-1build2"
          },
          {
            "binary_name": "yara",
            "binary_version": "4.5.0-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "yara",
        "purl": "pkg:deb/ubuntu/yara@4.5.0-1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.2-1",
        "4.4.0-1",
        "4.5.0-1",
        "4.5.0-1build1",
        "4.5.0-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyara10",
            "binary_version": "4.5.8-1"
          },
          {
            "binary_name": "yara",
            "binary_version": "4.5.8-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "yara",
        "purl": "pkg:deb/ubuntu/yara@4.5.8-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.5.5-1",
        "4.5.7-1",
        "4.5.8-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyara10",
            "binary_version": "4.5.5-1"
          },
          {
            "binary_name": "yara",
            "binary_version": "4.5.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "yara",
        "purl": "pkg:deb/ubuntu/yara@4.5.5-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.5.4-1",
        "4.5.5-1"
      ]
    }
  ],
  "aliases": [],
  "details": "An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files. The vulnerability is caused by insufficient validation of external-variable pointers, which may lead to invalid free in yr_rules_destroy() or wild pointer access in yr_object_create(). An attacker can provide a specially crafted .yrc file that causes memory corruption and application crash.",
  "id": "UBUNTU-CVE-2026-88340",
  "modified": "2026-10-17T09:54:16Z",
  "published": "2026-09-22T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-88340"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-88340"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/VirusTotal/yara/issues/2239"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/VirusTotal/yara/pull/2244"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/VirusTotal/yara/pull/2244/changes/8d7bef643ee5fa2381e235bcedf80170a6b00d3b"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-88340"
  ]
}



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