by Kastro
Paper/Archive/CVE-2025-4658

CVE-2025-4658

OPKSSH OPKSSH — Authentication Bypass in OPKSSH

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
35
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 27.6.276 × 205.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
OPKSSH0.1.0 – 0.4.0–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cloudflare (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/openpubkey/opkssh