Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The epa4all-client Maven package, versions before 1.2.1, does not check the result of an ECDSA signature verification in its trust validator for signed public keys. Any structurally valid signature is accepted as trusted, so an attacker who can supply such a signature can pass the trust check. Upgrade to version 1.2.1. No workaround is listed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.1 | High | 3.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0012, the 1st percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:20 UTC First seen by agentprime
- 31 Oct 2026, 14:20 UTC Confirmed by OSV