wc_VerifyEccsiHash missing sanity check_CVE-2026-5466

7.6 / 10

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

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.

Basic Information

ID CVE-2026-5466

Source wolfSSL

Published Apr 10, 2026 at 03:00

Modified Apr 10, 2026 at 13:43

Affected Product

Vendor wolfSSL

Product wolfSSL

Affected Versions wolfSSL wolfSSL 0

CWE Classification

CWE-347

References

github.com /wolfssl/wolfssl/pull/10102

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    "published": "2026-04-10T03:00:42.976Z",
    "modified": "2026-04-10T13:43:34.035Z",
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