TypesettingTools Aegisub up to 3.4.x code injection

Summaryinfo

A vulnerability identified as critical has been detected in TypesettingTools Aegisub up to 3.4.x. Affected is an unknown function. Performing a manipulation results in code injection. This vulnerability is cataloged as CVE-2026-92705. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in TypesettingTools Aegisub up to 3.4.x. This affects some unknown functionality. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-92705 since 09/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 3.5.0 eliminates this vulnerability.

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Productinfo

Vendor

• TypesettingTools

Name

• Aegisub

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4

Website

• Product: https://github.com/TypesettingTools/Aegisub/

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