# CVE-2026-5194: wolfSSL ECDSA Certificate Verification

CVE-2026-5194 is fixed in wolfssl on 1 platform, first by DEBIAN-CVE-2026-5194, released April 9, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-5194
- Priority: Urgent
- CVSS: 9.1 (Critical)
- EPSS: 0.0058
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 9, 2026
- Weakness: Improper Certificate Validation
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-5194

## Description

Missing hash/digest size and OID checks allow digests smaller than allowed when verifying ECDSA certificates, or smaller than is appropriate for the relevant key type, to be accepted by signature verification functions. This could lead to reduced security of ECDSA certificate-based authentication if the public CA key used is also known. This affects ECDSA/ECC verification when EdDSA or ML-DSA is also enabled.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | wolfssl Debian 12.15 (bookworm) | 5.5.4-2+deb12u3 | [DEBIAN-CVE-2026-5194](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5194.md) | Apr 9, 2026 |
| Linux | wolfssl Debian 13.5 (trixie) | 5.7.2-0.1+deb13u2 | [DEBIAN-CVE-2026-5194](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5194.md) | Apr 9, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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