🛡️ CVE-2026-5460
🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-416 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography (PQC) hybrid KeyShare processing. In the error handling path of TLSX_KeyShare_ProcessPqcHybridClient() in src/tls.c, the inner function TLSX_KeyShare_ProcessPqcClient_ex() frees a KyberKey object upon encountering an error. The caller then invokes TLSX_KeyShare_FreeAll(), which attempts to call ForceZero() on the already-freed KyberKey, resulting in writes of zero bytes over freed heap memory.

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CWE CWE-416
Public Exploit ✅ No
Source NVD
Published 2026-04-10
Updated 2026-06-02
Modified 2026-04-29

Affected Packages

Software From version Fixed in
wolfssl — 5.9.1

References

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