CVE-2025-29785

Name	CVE-2025-29785
Description	quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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
golang-github-lucas-clemente-quic-go (PTS)	bullseye	0.19.3-1	vulnerable
	bookworm	0.29.0-1	vulnerable
	sid, trixie	0.50.1-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-github-lucas-clemente-quic-go	source	(unstable)	0.50.1-1

Notes

https://github.com/quic-go/quic-go/security/advisories/GHSA-j972-j939-p2v3
https://github.com/quic-go/quic-go/issues/4981
Fixed by: https://github.com/quic-go/quic-go/commit/b90058aba5f65f48e0e150c89bbaa21a72dda4de (v0.50.1)