Bug 2548876 (CVE-2026-92705)

Summary: CVE-2026-92705 aegisub: Aegisub: Arbitrary code execution via untrusted automation script loading
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Aegisub. The application automatically loads and runs automation scripts referenced within Advanced SubStation Alpha (ASS) subtitle project files without prompting the user for confirmation. By tricking a user into opening a specially crafted subtitle file referencing a malicious script, an attacker can achieve arbitrary code execution with the permissions of the Aegisub process.
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Bug Depends On: 2545921, 2550249    
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Description OSIDB Bzimport 2026-10-09 20:52:06 UTC
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.