Improper Verification of Cryptographic Signature in com.oviva.telematik:epa4all-client
Impact
An attacker who can MITM the TLS connection between the client and the IDP (within the TI network) can substitute a forged discovery document. The forged document redirects u ri_puk_idp_enc and uri_puk_idp_sig to attacker-controlled URLs. The client then encrypts the SMC-B-signed challenge response to the attacker's encryption key and POSTs it to the attacker's auth endpoint. This captures the signed authentication material.
Patches
Workarounds
None.
Resources
- MS-OVIVA-EPA4ALL-d453c1
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 | < 1.2.2 | 1.2.2 |
References
- https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf
- https://nvd.nist.gov/vuln/detail/CVE-2026-45575
- https://github.com/oviva-ag/epa4all-client/pull/36
- https://github.com/oviva-ag/epa4all-client/commit/9111d6fbb939007036a7f74b2a93bb278cb5af32
- https://github.com/oviva-ag/epa4all-client
- https://github.com/oviva-ag/epa4all-client/releases/tag/v1.2.2
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-347- Platform
- Java / Kotlin (Maven)
- Package
com.oviva.telematik:epa4all-client- Disclosed
- 15.05.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-gqx7-6552-67hf - 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
-
Improper Verification of Cryptographic Signature in com.oviva.telematik:epa4all-client this entry
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