CVE-2026-5466
wc_VerifyEccsiHash missing sanity check
- State
- Published
- Severity
- 7.6 High
- Published
- Apr 10, 2026
- Updated
- Apr 22, 2026
- Reserved
- Apr 3, 2026
Description
wolfSSL's ECCSI signature verifier `wc_VerifyEccsiHash` decodes the `r` and `s` scalars from the signature blob via `mp_read_unsigned_bin` with no check that they lie in `[1, q-1]`. A crafted forged signature could verify against any message for any identity, using only publicly-known constants.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.6 High | CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | wolfSSL |
Weaknesses
- CWE-347 Improper verification of cryptographic signature
Affected Products
| Product | Versions |
|---|---|
wolfSSLwolfSSL |
|
References
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