PT-2026-31862 · Wolfssl · Wolfssl

Published 2026-04-10 · Updated 2026-04-11 · CVE-2026-5466

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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 · 11

• https://security-tracker.debian.org/tracker/CVE-2026-5466 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5466 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5466 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-5466 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5466 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5466 · Vendor Advisory
• https://github.com/wolfssl/wolfssl/pull/10102 · Note
• https://github.com/wolfSSL/wolfssl/pull/10102 · Note
• https://twitter.com/CVEarity/status/2042912404389138452 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2042518248311116084 · Twitter Post
• https://twitter.com/CVEnew/status/2042561780459933791 · Twitter Post