Low severity · published Sep 29, 2026
CVE-2026-102825
Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime path
3.7
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RU
russh · Eugeny
< 0.62.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102825
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102825
x_refsource_CONFIRM
https://github.com/Eugeny/russh/security/advisories/GHSA-g6xm-f9xp-qq35
x_refsource_MISC
https://github.com/Eugeny/russh/commit/f8fd0b11a393364dc7f01a182482d86adafdd653
x_refsource_MISC
https://github.com/Eugeny/russh/releases/tag/v0.62.6
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