CVE-2026-5466HIGH 8.1EPSS p2.2%

CVE-2026-5466CVE-2026-5466

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.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.12% probability of exploitation · percentile 2.2% · 2026-06-17T12:03:21Z
Published2026-04-10
Last modified2026-04-29

Underlying weaknesses· 1

CWE-347

References

  1. https://github.com/wolfssl/wolfssl/pull/10102

1

TypeTargetConfidenceTier
WeaknessImproper Verification of Cryptographic Signaturecwe-3470%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.