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CVE-2026-46705

Russh is a Rust SSH client & server library. From version 0.34.0-beta.1 to before version 0.61.0, the russh server authentication path keeps internal userauth state across SSH_MSG_USERAUTH_REQUEST messages without separating that state when the request principal changes. RFC 4252 allows the user name and service name fields to change between authentication requests. The issue is not that such changes are invalid. The issue is that russh-owned authentication state, such as remaining methods, part
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a1f0b0264dea21b02cd692a1a13cc0ab1fbcf21e554286fdebfe289b37af7e14
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"russh","vendor":"Eugeny","versions":[{"status":"affected","version":">= 0.34.0-beta.1, < 0.61.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5a18a1a1fd41cc9dfbba2bb2adc43ca3445d64828df5439b32fa929aee2ef86a · sha256:a4b9b34094797d57… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5a18a1a1fd41cc9dfbba2bb2adc43ca3445d64828df5439b32fa929aee2ef86a · sha256:a4b9b34094797d57… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5a18a1a1fd41cc9dfbba2bb2adc43ca3445d64828df5439b32fa929aee2ef86a · sha256:a4b9b34094797d57… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-hpv4-5h6f-wqr3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a18a1a1fd41cc9dfbba2bb2adc43ca3445d64828df5439b32fa929aee2ef86a · sha256:a4b9b34094797d57… · /containers/adp/0/references/0
{"name":"https://github.com/Eugeny/russh/security/advisories/GHSA-hpv4-5h6f-wqr3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-hpv4-5h6f-wqr3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a18a1a1fd41cc9dfbba2bb2adc43ca3445d64828df5439b32fa929aee2ef86a · sha256:a4b9b34094797d57… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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