CVE-2025-11934
Improper Validation of Signature Algorithm Used in TLS 1.3 CertificateVerify
Reported by wolfssl · Published November 21, 2025
Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| wolfssl | www.wolfssl.com | 5.8.4 |
| wolfssl | Alpine | 5.9.1-r0, 5.8.4-r0 |
| wolfssl | wolfssl | 5.8.4 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| wolfSSL | wolfSSL | 3.12.0 |
| wolfSSL | wolfSSL | 3.12.0 |
Timeline
- Nov 21, 2025 CVE Published
- Nov 21, 2025 PoC Published
- Nov 22, 2025 EPSS Score (30 in total, the first dated here)
- Nov 22, 2025 Coalition ESS Score (4 in total, the first dated here)
- Jun 2, 2026 Security Advisory
- Oct 19, 2026 CVE Updated
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2025-11934
vulnetix vdb fixes CVE-2025-11934Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2025-11934/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart