epa4all-client has a VAU Signature bypass
Impact
In SignedPublicKeysTrustValidatorImpl.isTrusted(), the ECDSA signature verification at line 45 discards the boolean return value of Signature.verify(). The method performs certificate chain validation, OCSP check, and signature algorithm setup, but never checks whether the signature actually matches. For any structurally valid signature, it returns true.
Patches
Patched in #34.
Workarounds
None.
Resources
Credits
Machine Spirits (contact@machinespirits.de)
- Dr. rer. nat. Simon Weber
- Dipl.-Inf. Volker Schönefeld
- Chiara Fliegner
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | com.oviva.telematik:epa4all-client | < 1.2.1 | 1.2.1 |
References
- CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-295- Platform
- Java / Kotlin (Maven)
- Package
com.oviva.telematik:epa4all-client- Disclosed
- 08.05.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-g8r3-5hwf-qp96 - CC BY 4.0
Vulnerability history: com.oviva.telematik:epa4all-client
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 05.2026 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 3
Disclosures per year
- 2026: 3
-
epa4all-client has a VAU Signature bypass this entry
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