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Improper Neutralization of Null Byte or NUL Character Affecting aegisub package, versions *

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.13% (3rd percentile)

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  • Snyk IDSNYK-ECHOLATEST-AEGISUB-20746358
  • published10 Oct 2026
  • disclosed9 Oct 2026
Report a new vulnerability Found a mistake?

Introduced: 9 Oct 2026

NewCVE-2026-92705  (opens in a new tab)
CWE-158  (opens in a new tab)
CWE-829  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest aegisub.

NVD Description

Note: Versions mentioned in the description apply only to the upstream aegisub package and not the aegisub package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.