CVE-2025-4658

Authentication Bypass in OPKSSH

CVSS 9.3 CRITICALEPSS 0.3%CWE-305

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.3EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

13 May 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification. As OPKSSH depends on the OpenPubkey library for authentication, this vulnerability in OpenPubkey also applies to OPKSSH versions prior to 0.5.0 and would allow an attacker to bypass OPKSSH authentication.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Affected products

OPKSSH · OPKSSH

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References

https://github.com/openpubkey/opkssh