CVE-2026-44900 Details
Description
epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.1, 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. This vulnerability is fixed in 1.2.1.
A vulnerability exists in the oviva epa4all-client Java library, specifically in versions prior to 1.2.1. The issue arises in the SignedPublicKeysTrustValidatorImpl.isTrusted() method, where the ECDSA signature verification improperly ignores the boolean result of the Signature.verify() call. Although the method conducts certificate chain validation, OCSP checks, and sets up the signature algorithm, it fails to verify if the signature actually corresponds. As a result, the method returns true for any structurally valid signature, creating a trust validation bypass.
Users can upgrade to version 1.2.1 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 26, 2026CISA-ADP
Assessed May 28, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/oviva-ag/epa4all-client/pull/34 | [email protected] | Source CodeVendor |
| https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-g8r3-5hwf-qp96 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-295 | Improper Certificate Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| oviva-ag epa4all-client | < 1.2.1 (semver) |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | New CVE Received | [email protected] |