Dashboard / CVE-2026-5466

CVE-2026-5466

HIGH
MEDIUM Priority: 0.01 BB Relevance: 60/100
Published: 2026-04-10 Modified: 2026-11-11 First seen: 2026-11-11 Status: active

Attack Surface

Adjacent Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Adjacent
AC: Low
PR: None
UI: None
S: X
AT: Present
VC: High
VI: High
VA: None

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
wolfssl wolfssl < 5.9.1

References & Advisories (1)

Bug Bounty Relevance

60 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.6 / 10.0 v4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.20%
Raw Score 0.001970
Percentile 9.5%
Date 2026-11-14

EPSS Trend

2026-11-14
0.00197
2026-11-13
0.00197
2026-11-12
0.00197
2026-11-10
0.00197

Intelligence Sources

nvd ref →

External Links