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Fencer Intel
low 3.7

CVE-2026-102825 json

Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime path

published last mo. modified last mo. also EUVD-2026-89365 , GHSA-g6xm-f9xp-qq35

cvss
3.7
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 29%
public exploits
0
none known

Summary

Russh is a Rust SSH client and server library. Prior to 0.62.6, the USERAUTH_REQUEST path reached from server::run_stream in russh/src/server/encrypted.rs increments self.common.auth_attempts but never compares it with server::Config.max_auth_attempts. An unauthenticated remote client can continue submitting authentication requests on one connection beyond the configured cap, bypassing the deployment's attempt-limiting policy and increasing online guessing opportunity and backend authentication workload. This issue is fixed in version 0.62.6.

Patch / fix

  • crates.io russh 0.62.6
  • warpgate_project warpgate 0.62.6
  • russh_project russh 0.62.6
  • rust-russh Debian 14 0.64.1-1

debian advisories DEBIAN-CVE-2026-102825

  • openshell hummingbird 1 0.1.2-0.2.hum1
  • openshell-gateway hummingbird 1 0.1.2-0.2.hum1
  • python3-openshell hummingbird 1 0.1.2-0.2.hum1

red hat advisories RHSA-2026:74586

Is CVE-2026-102825 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.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-102825 updated cvss 3.7

russh: russh: Authentication attempt limit bypass via unenforced maximum authentication attempts

  • Red Hat Hardened Images openshell 0.1.2-0.2.hum1, openshell-gateway 0.1.2-0.2.hum1, python3-openshell 0.1.2-0.2.hum1
    fixed: vendor fix RHSA-2026:74586

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/Eugeny/russh/security/advisories/GHSA-g6xm-f9xp-qq35 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
crates.io russh
<0.62.6
0.62.6

Affected products

  • Eugeny russh

Classification

Weakness
  • CWE-307 Improper Restriction of Excessive Authentication Attempts

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.