CVE-2026-13500

Name	CVE-2026-13500
Description	A weakness has been identified in antlr ANTLR4 up to 4.13.2. Affected is an unknown function of the file tool/src/org/antlr/v4/codegen/model/OutputFile.java of the component Grammar Action Block Handler. Executing a manipulation can lead to code injection. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
antlr4 (PTS)	bookworm, bullseye	4.7.2-5	undetermined
	forky, sid, trixie	4.9.2-3	undetermined

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
antlr4	source	(unstable)	undetermined

https://github.com/wooyun123/wooyun/issues/4
https://github.com/antlr/antlr4/issues/4952
check upstream reporting and status