CVE-2026-34183

Name	CVE-2026-34183
Description	Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames. Impact summary: A malicious remote peer can cause an unbounded memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or server and a Denial of Service. A remote peer may exhaust heap memory by flooding the local QUIC stack with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception of the PATH_RESPONSE frame which will not be done by a malicious peer. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.
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
openssl (PTS)	bullseye	1.1.1w-0+deb11u1	fixed
	bullseye (security)	1.1.1w-0+deb11u7	fixed
	bookworm	3.0.20-1~deb12u1	fixed
	bookworm (security)	3.0.20-1~deb12u2	fixed
	trixie	3.5.6-1~deb13u1	vulnerable
	trixie (security)	3.5.6-1~deb13u2	fixed
	forky, sid	3.6.2-1	vulnerable

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

Package	Type	Release	Fixed Version
openssl	source	bullseye	(not affected)
openssl	source	bookworm	(not affected)
openssl	source	trixie	3.5.6-1~deb13u2
openssl	source	(unstable)	(unfixed)

Notes

[bookworm] - openssl <not-affected> (Vulnerable code not present)
[bullseye] - openssl <not-affected> (Vulnerable code not present)
https://openssl-library.org/news/secadv/20260609.txt