Aegisub executes arbitrary code through automatically loaded Automation scripts

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92705
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-09 21:17:06 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionAegisub 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.001300000 probability, percentile 0.023370000 (date 2026-10-16)

Problem Types: CWE-158 | CWE-829 | CWE-158 CWE-158: Improper Neutralization of Null Byte or NUL Character | CWE-829 CWE-829: Inclusion of Functionality from Untrusted Control Sphere

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TypesettingTools Aegisub affected >= 3.2.0, < 3.5.0 Not specified

References

ReferenceSourceLinkTags
github.com/TypesettingTools/Aegisub/commit/e4099055711cce327840870c050ce... [email protected] github.com
github.com/TypesettingTools/Aegisub/commit/0a3073d59f10432eeebea65018b02... [email protected] github.com
github.com/TypesettingTools/Aegisub/commit/b5bf23979e7453f7b1cc8ffeb82b3... [email protected] github.com
github.com/TypesettingTools/Aegisub/security/advisories/GHSA-67hq-5vgg-6f23 [email protected] github.com
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