CVE-2026-123613

Name	CVE-2026-123613
Description	Rustls from 0.23.13 before 0.23.45 accepts TLS 1.3 handshake messages at the wrong encryption level when they follow a key-changing message in the same record, because Deframer::aligned does not enforce RFC 8446 record-boundary alignment. A peer or on-path attacker can pack a plaintext EncryptedExtensions with the ServerHello, which rustls accepts unencrypted.
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
rust-rustls (PTS)	bookworm	0.20.8-4	vulnerable
	trixie	0.23.26+ds-1	vulnerable
	forky	0.23.45+ds-1	fixed
	sid	0.23.46+ds-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rust-rustls	source	(unstable)	0.23.45+ds-1

Notes

[trixie] - rust-rustls <no-dsa> (Minor issue)
[bookworm] - rust-rustls <postponed> (Limited support, minor issue)
https://rustsec.org/advisories/RUSTSEC-2026-0285.html
https://github.com/rustls/rustls/security/advisories/GHSA-2mjx-qc3c-rqvc