CVE-2025-4658 json
Authentication Bypass in OPKSSH
published last yr. modified 4mo ago also GHSA-56wx-66px-9j66 , GO-2025-3680 , EUVD-2025-14477
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/openpubkey/opkssh 0.5.0
- openpubkey openpubkey 0.10.0
- openpubkey opkssh 0.5.0
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20250515T200012-1.1
opensuse advisories openSUSE-SU-2025:15135-1
Is CVE-2025-4658 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- last yr.
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 |
| CNA | 4.0 | 9.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/openpubkey/opkssh | <0.5.0 |
0.5.0 |
Affected products
- OPKSSH OPKSSH
Classification
References
-
github.com
/openpubkey/opkssh
package, product
-
github.com
/openpubkey/opkssh/security/advisories/GHSA-56wx-66px-9j66
web, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-4658
advisory
Sources
- CVE List CVE-2025-4658
- GitHub Advisory GHSA-56wx-66px-9j66
- NVD CVE-2025-4658
- OSV GO-2025-3680
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.