PT-2026-31862 · Wolfssl · Wolfssl

Published 2026-04-10 · Updated 2026-04-10 · CVE-2026-5466

Positive Technologies (AI Summary)

CVSS v4.0

7.6

High

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

Name of the Vulnerable Software and Affected Versions wolfSSL (affected versions not specified)

Description The ECCSI signature verifier wc VerifyEccsiHash in wolfSSL decodes the r and s scalars from the signature blob using mp read unsigned bin without verifying that these values fall within the expected range of [1, q-1]. This allows for the creation of a crafted, forged signature that can be successfully verified against any message for any identity, utilizing only publicly available constants.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-5466

Affected Products

Wolfssl

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-5466 · Security Note
• https://twitter.com/VulmonFeeds/status/2042518248311116084 · Twitter Post
• https://github.com/wolfssl/wolfssl/pull/10102 · Note
• https://twitter.com/CVEnew/status/2042561780459933791 · Twitter Post