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Advisory record · GHSA-c8m5-c952-6cm4

Rustls: Session Debug formatting exposes TLS master secrets and resumption PSKs

CVSS 4.0 Medium

Published by the GitHub Advisory Database at 27 Oct 2026, 16:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
rustlscrates.io<0.23.46 || >=0.24.0-dev.1, <0.24.0-dev.20.23.46, 0.24.0-dev.2
Identifiers
GHSA-c8m5-c952-6cm4 · RUSTSEC-2026-0346
Weakness (CWE)
CWE-212
Tags
Published
27 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 below 0.23.46, and 0.24.0-dev.1 only, are affected; the fixed versions are 0.23.46 and 0.24.0-dev.2. Debug formatting of TLS 1.2 and TLS 1.3 client session values can expose the TLS master secret or resumption PSK. Exposure requires a custom session store that formats these values into logs, and a reader of those logs could then recover keys. Upgrade to 0.23.46 or 0.24.0-dev.2.

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
4.0 Medium 3.1 CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/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.