UBUNTU-CVE-2026-92705 (CVE-2026-92705)

Vulnerability from osv_ubuntu – Published: 2026-10-09 21:17 – Updated: 2026-10-17 09:57 – Source website
VLAI
Details

Aegisub is a cross-platform advanced subtitle editor. From 3.2.0 to 3.4.2, Aegisub automatically loads Automation scripts referenced by Automation Scripts metadata in ASS subtitle projects without asking whether the user trusts the scripts or their authors. An attacker can distribute a crafted ASS file together with a referenced malicious Automation script, and opening the AS  file executes arbitrary code with the privileges of the Aegisub process. From 3.4.0 to 3.4.2, inconsistent handling of embedded NUL characters between extension validation and filesystem operations additionally allows a crafted ASS/Lua polyglot to reference and execute itself as a single-file variant. The vulnerability is fixed in Aegisub 3.5.0.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "aegisub",
            "binary_version": "3.2.2+dfsg-3"
          },
          {
            "binary_name": "aegisub-l10n",
            "binary_version": "3.2.2+dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "aegisub",
        "purl": "pkg:deb/ubuntu/aegisub@3.2.2+dfsg-3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.2+dfsg-2",
        "3.2.2+dfsg-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "aegisub",
            "binary_version": "3.2.2+dfsg-5ubuntu3"
          },
          {
            "binary_name": "aegisub-l10n",
            "binary_version": "3.2.2+dfsg-5ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "aegisub",
        "purl": "pkg:deb/ubuntu/aegisub@3.2.2+dfsg-5ubuntu3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.2+dfsg-4build1",
        "3.2.2+dfsg-5",
        "3.2.2+dfsg-5ubuntu1",
        "3.2.2+dfsg-5ubuntu2",
        "3.2.2+dfsg-5ubuntu3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "aegisub",
            "binary_version": "3.2.2+dfsg-7.1build2"
          },
          {
            "binary_name": "aegisub-l10n",
            "binary_version": "3.2.2+dfsg-7.1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "aegisub",
        "purl": "pkg:deb/ubuntu/aegisub@3.2.2+dfsg-7.1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.2+dfsg-7build2",
        "3.2.2+dfsg-7.1",
        "3.2.2+dfsg-7.1build1",
        "3.2.2+dfsg-7.1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "aegisub",
            "binary_version": "3.4.2+ds-5"
          },
          {
            "binary_name": "aegisub-common",
            "binary_version": "3.4.2+ds-5"
          },
          {
            "binary_name": "aegisub-l10n",
            "binary_version": "3.4.2+ds-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "aegisub",
        "purl": "pkg:deb/ubuntu/aegisub@3.4.2+ds-5?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.2+ds-3",
        "3.4.2+ds-4",
        "3.4.2+ds-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "aegisub",
            "binary_version": "3.4.2+ds-3"
          },
          {
            "binary_name": "aegisub-l10n",
            "binary_version": "3.4.2+ds-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "aegisub",
        "purl": "pkg:deb/ubuntu/aegisub@3.4.2+ds-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.2+dfsg-7.2ubuntu2",
        "3.4.2+ds-1build1",
        "3.4.2+ds-1build2",
        "3.4.2+ds-2",
        "3.4.2+ds-3"
      ]
    }
  ],
  "aliases": [],
  "details": "Aegisub is a cross-platform advanced subtitle editor. From 3.2.0 to 3.4.2, Aegisub automatically loads Automation scripts referenced by `Automation Scripts` metadata in `ASS` subtitle projects without asking whether the user trusts the scripts or their authors. An attacker can distribute a crafted `ASS` file together with a referenced malicious Automation script, and opening the `AS`\u00a0 file executes arbitrary code with the privileges of the Aegisub process. From 3.4.0 to 3.4.2, inconsistent handling of embedded `NUL` characters between extension validation and filesystem operations additionally allows a crafted `ASS/Lua` polyglot to reference and execute itself as a single-file variant. The vulnerability is fixed in Aegisub 3.5.0.",
  "id": "UBUNTU-CVE-2026-92705",
  "modified": "2026-10-17T09:57:17Z",
  "published": "2026-10-09T21:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92705"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-92705"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/TypesettingTools/Aegisub/commit/0a3073d59f10432eeebea65018b02ef4d0a87fff"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/TypesettingTools/Aegisub/commit/b5bf23979e7453f7b1cc8ffeb82b3cc2d2ca75e6"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/TypesettingTools/Aegisub/commit/e4099055711cce327840870c050ce46e58f4aee0"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/TypesettingTools/Aegisub/security/advisories/GHSA-67hq-5vgg-6f23"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-92705"
  ]
}



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