CVE Catalog

CVE-2026-92705

HighCVSS 7.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.13%

2th percentile - higher than 2% of all known CVEs

Summary

Aegisub versions 3.2.0 through 3.4.2 automatically load Automation scripts referenced in ASS subtitle project metadata without asking whether the user trusts the scripts or their authors. Opening a crafted ASS file can execute arbitrary code with the privileges of the Aegisub process; in versions 3.4.0–3.4.2, inconsistent NUL handling also allows a crafted ASS/Lua polyglot to execute itself. The vulnerability is fixed in Aegisub 3.5.0.

Risk Assessment

An attacker can distribute malicious subtitle files whose opening leads to code execution on the victim's machine. This can result in system compromise or data theft.

Recommendation

Update Aegisub to version 3.5.0 or later. Do not open ASS files from untrusted sources.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS