Vulnerability · Published Jul 24, 2026 · Assigned by GitHub_M
CVE-2026-48021epa4all Security Incident: Implement keystore based on Telematik TSL, implement hostname check and certificate check for lib-vau
Critical 9.1
In plain English
A critical-severity improper certificate validation in epa4all from med-united. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Official description
In epa4all, prior to version 2026-05-20, an attacker who can intercept the TLS connection between epa4all and the ePA backend can complete the VAU handshake with attacker-controlled keys and obtain the session encryption keys. All inner HTTP traffic (patient consent decisions, medication data, document operations, authorization tokens, and entitlement queries) becomes readable and modifiable. The attacker can also inject arbitrary requests through the hijacked channel. This issue has been patched in version 2026-05-20.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| med-united | epa4all | < 2026-05-20 |
Weakness: CWE-295, CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://github.com/med-united/epa4all/security/advisories/GHSA-vvh7-x6c7-46gh x_refsource_CONFIRM
- https://github.com/med-united/epa4all/releases/tag/2026-05-20 x_refsource_MISC
- https://www.machinespirits.com/advisory/aa49f0 x_refsource_MISC