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Advisory record · GHSA-2mjx-qc3c-rqvc

Rustls: TLS 1.3 handshake messages incorrectly accepted across encryption level boundaries

CVSS 5.3 Medium

Published by the GitHub Advisory Database at 5 Oct 2026, 23:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
rustlscrates.io>=0.23.13, <0.23.450.23.45
Identifiers
GHSA-2mjx-qc3c-rqvc · RUSTSEC-2026-0285
Published
5 Oct 2026
Updated
27 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Rustls versions 0.23.13 through 0.23.44 accept TLS 1.3 handshake messages sent at the wrong encryption level when they follow a key-changing message in the same record. An attacker in a network position can inject plaintext handshake messages that rustls accepts, but cannot use this to alter or complete a handshake because the transcript remains authenticated. Upgrade to rustls 0.23.45, which contains the fix.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.