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Advisory record · GHSA-35g8-35p8-c8fw

Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey

CVSS 6.5 MediumEPSS 0.0036 · 29th percentile

Published by the GitHub Advisory Database at 30 Sept 2026, 23:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
russhcrates.io<0.63.20.63.2
Identifiers
GHSA-35g8-35p8-c8fw · CVE-2026-102821
Weakness (CWE)
CWE-400 · CWE-770
Tags
Published
30 Sept 2026
Updated
1 Oct 2026

Machine-written summary

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

russh versions before 0.63.2 are affected. A remote peer can start a key re-exchange on a russh server, never complete it, and flood channel-open requests, causing memory use to grow without bound until the process runs out of memory. Upgrade to russh 0.63.2.

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
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0036, the 29th percentile, on 7 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.