Description
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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OPKSSH | OPKSSH | 0.1.0 – ≤ 0.4.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | opkssh | No fix yet | — |
| Ubuntu 25.10 | opkssh | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | opkssh | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | govulncheck-vulndb | 0.0.20250515T200012-1.1 | openSUSE-SU-2025:15135-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/openpubkey/opkssh | < 0.5.0 | 0.5.0 | GHSA-56wx-66px-9j66 |
Advisories 1
- openSUSE-SU-2025:15135-1 govulncheck-vulndb-0.0.20250515T200012-1.1 on GA media SUSE / openSUSE Security Updates · Feb 5, 2026