CVE-2026-0994

Name	CVE-2026-0994
Description	A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages. Due to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python’s recursion stack and causing a RecursionError.
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)
Debian Bugs	1126302

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
protobuf (PTS)	bullseye	3.12.4-1+deb11u1	vulnerable
	bookworm	3.21.12-3	vulnerable
	trixie	3.21.12-11	vulnerable
	forky, sid	3.21.12-15	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
protobuf	source	(unstable)	(unfixed)			1126302

https://github.com/protocolbuffers/protobuf/issues/25070
https://github.com/protocolbuffers/protobuf/pull/25239