CVE-2026-92705 (GCVE-0-2026-92705)

Vulnerability from cvelistv5 – Published: 2026-10-09 20:37 – Updated: 2026-10-09 20:37
VLAI
Title
Aegisub executes arbitrary code through automatically loaded Automation scripts
Summary
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
CWE
  • CWE-158 - Improper Neutralization of Null Byte or NUL Character
  • CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7610 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
TypesettingTools Aegisub Affected: >= 3.2.0, < 3.5.0
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Aegisub",
          "vendor": "TypesettingTools",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.2.0, \u003c 3.5.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "CWE-158: Improper Neutralization of Null Byte or NUL Character",
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            }
          ]
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        {
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            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-09T20:37:58.321Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/TypesettingTools/Aegisub/security/advisories/GHSA-67hq-5vgg-6f23",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/TypesettingTools/Aegisub/security/advisories/GHSA-67hq-5vgg-6f23"
        },
        {
          "name": "https://github.com/TypesettingTools/Aegisub/commit/0a3073d59f10432eeebea65018b02ef4d0a87fff",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/TypesettingTools/Aegisub/commit/0a3073d59f10432eeebea65018b02ef4d0a87fff"
        },
        {
          "name": "https://github.com/TypesettingTools/Aegisub/commit/b5bf23979e7453f7b1cc8ffeb82b3cc2d2ca75e6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/TypesettingTools/Aegisub/commit/b5bf23979e7453f7b1cc8ffeb82b3cc2d2ca75e6"
        },
        {
          "name": "https://github.com/TypesettingTools/Aegisub/commit/e4099055711cce327840870c050ce46e58f4aee0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/TypesettingTools/Aegisub/commit/e4099055711cce327840870c050ce46e58f4aee0"
        }
      ],
      "source": {
        "advisory": "GHSA-67hq-5vgg-6f23",
        "discovery": "UNKNOWN"
      },
      "title": "Aegisub executes arbitrary code through automatically loaded Automation scripts"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-92705",
    "datePublished": "2026-10-09T20:37:58.321Z",
    "dateReserved": "2026-09-16T16:22:31.542Z",
    "dateUpdated": "2026-10-09T20:37:58.321Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-92705",
      "date": "2026-10-10",
      "epss": "0.0013",
      "percentile": "0.02292"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "Aegisub",
                "vendor": "TypesettingTools",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 3.2.0, \u003c 3.5.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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": "CVE-2026-92705",
        "lastModified": "2026-10-09T21:17:06.360",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-09T21:17:06.360",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/TypesettingTools/Aegisub/commit/0a3073d59f10432eeebea65018b02ef4d0a87fff"
          },
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            "source": "security-advisories@github.com",
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            "url": "https://github.com/TypesettingTools/Aegisub/commit/e4099055711cce327840870c050ce46e58f4aee0"
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            "source": "security-advisories@github.com",
            "url": "https://github.com/TypesettingTools/Aegisub/security/advisories/GHSA-67hq-5vgg-6f23"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-158"
              },
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                "lang": "en",
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              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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