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Fencer Intel
medium 6.5

CVE-2026-68930 json

Russh: Channel-scoped server callbacks can be reached without an open channel

published 3mo ago modified 19d ago also EUVD-2026-52337 , GHSA-m65r-rprj-r5rg

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

Russh is a Rust SSH client & server library. Prior to 0.62.5, russh dispatches channel-scoped Handler callbacks for recipient channel IDs that were never opened or confirmed in russh/src/server/encrypted.rs, server_read_authenticated, and the exec_request callback. Version 0.62.5 fixes the issue.

Patch / fix

  • crates.io russh 0.62.5
  • russh_project russh 0.62.5
  • warpgate_project warpgate 0.62.5
  • rust-russh Debian 14 0.64.1-1

debian advisories DEBIAN-CVE-2026-68930

Is CVE-2026-68930 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/Eugeny/russh/security/advisories/GHSA-m65r-rprj-r5rg referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
crates.io russh
<0.62.5
0.62.5

Affected products

  • Eugeny russh

Classification

Weakness
  • CWE-666 Operation on Resource in Wrong Phase of Lifetime
  • CWE-696 Incorrect Behavior Order
  • CWE-863 Incorrect Authorization

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.