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.
References (1)
Scores
CVSS v3
8.1
EPSS
0.0001
EPSS Percentile
0.7%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-347
Status
published
Products (2)
wolfSSL/wolfSSL
< 5.9.1
wolfssl/wolfssl
< 5.9.1
Published
Apr 10, 2026
Tracked Since
Apr 10, 2026