CVE-2026-5460
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.
- Score
- CVSS 3.1 6.5 Medium
- Status
- Analyzed - facts@wolfssl.com
- Published
- 2026-04-10
- Last modified
- 2026-04-10
- Weaknesses
- CWE-416
Affected products
References
- https://github.com/wolfssl/wolfssl/pull/10092
