CVE-2026-5466CWE-347

wc_VerifyEccsiHash missing sanity check

High · published April 10, 2026

CVSS v4.0
7.6
EPSS
0%
Percentile
6.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.6 · HIGH
Vector
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
EPSS
0.00175 · 6.7th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-04-10T03:00Z
EPSS history
Timeline
  • 10 APR 03:00Z
    wc_VerifyEccsiHash missing sanity check
    cvelistv5