PT-2026-31828 · Wolfssl · Wolfssl

Calvin Young + 1 · Published 2026-04-09 · Updated 2026-04-14 · CVE-2026-5460

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

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

Description A heap use-after-free issue exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. Specifically, within the TLSX KeyShare ProcessPqcHybridClient() function in src/tls.c, an error handling path incorrectly frees a KyberKey object. Subsequently, the TLSX KeyShare FreeAll() function attempts to zero out the already-freed KyberKey using ForceZero(), leading to a write to freed heap memory.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-5460

Affected Products

Wolfssl

References · 9

• https://github.com/wolfssl/wolfssl/pull/10092 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-5460 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5460 · Security Note
• https://ubuntu.com/security/CVE-2026-5460 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-5460 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5460 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5460 · Vendor Advisory
• https://twitter.com/CVEarity/status/2042643917586444498 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2044070059786522713 · Twitter Post