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Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M

CVE-2026-111062A russh SSH server accepts a publickey authentication whose signature uses a different algorithm than the one named in the request

Low 2.3

In plain English

A low-severity security flaw in russh from Eugeny. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 4.0)2.3Low
Exploit odds (30 days)0.4%top 70.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

russh is a Rust SSH client and server library. From version 0.34.0-beta.1 until version 0.64.0, its SSH server does not require the signature algorithm in a public-key authentication signature to match the algorithm named in the authentication request. A client possessing an authorized RSA private key can announce  rsa-sha2-512  while supplying a valid  ssh-rsa  SHA-1 signature, bypassing restrictions or producing misleading audit records when applications rely on the requested algorithm. A valid private-key signature remains required, and russh clients are not affected. This issue is fixed in version 0.64.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:26.10rust-russhno fix listedUBUNTU-CVE-2026-111062

Affected products (as reported)

VendorProductVersions
Eugeny russh >= 0.34.0-beta.1, < 0.64.0

Weakness: CWE-347 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References