{"cve":"CVE-2026-44900","nvd":{"published":"2026-05-26T22:16:42.873","modified":"2026-07-24T11:10:00.170","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-295"],"references":["https://github.com/oviva-ag/epa4all-client/pull/34","https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-g8r3-5hwf-qp96"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-44900","score":0.00121,"percentile":0.01859,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-g8r3-5hwf-qp96","url":"https://osv.dev/vulnerability/GHSA-g8r3-5hwf-qp96","summary":"epa4all-client has a VAU Signature bypass","modified":"2026-06-08T23:45:14.931187763Z","packages":[{"ecosystem":"Maven","name":"com.oviva.telematik:epa4all-client","purl":"pkg:maven/com.oviva.telematik/epa4all-client","ranges":["<1.2.1"],"fixed":["1.2.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}