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Advisory record · GHSA-4p9f-7p9m-5vfg

russh's SSH client is susceptible to unbounded allocations via EXT_INFO packets

CVSS 4.3 MediumEPSS 0.0026 · 17th percentile

Published by the GitHub Advisory Database at 30 Oct 2026, 22:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
russhcrates.io<0.650.65
Identifiers
GHSA-4p9f-7p9m-5vfg · CVE-2026-116773
Weakness (CWE)
CWE-770
Tags
Published
30 Oct 2026
Updated
30 Oct 2026

Machine-written summary

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

GHSA-4p9f-7p9m-5vfg affects the russh crate (crates.io) before version 0.65. A malicious SSH server can send an unlimited stream of EXT_INFO packets to a russh client before authentication, and the client keeps every extension name in memory for the life of the session, so client memory grows without bound. Upgrade russh to version 0.65 or later. The source gives no workaround.

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
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0026, the 17th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

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.