CVE-2026-5466

HighCVSS 8.1/10Last modified Jun 17, 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.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-347

Affected software

No affected versions have been published.

Timeline

Published: Apr 10, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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