by Kastro
Paper/Archive/CVE-2026-7531

CVE-2026-7531

wolfSSL wolfSSL — Use-after-free in PQC hybrid key-share handling

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 42.7.427 × 208.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Use-after-free in PQC hybrid key-share handling. This is an incomplete-fix follow-up to CVE-2026-5460 (released in 5.9.1): a malicious TLS 1.3 server sending a truncated PQC hybrid KeyShare can still trigger the error cleanup path to operate on freed memory.

Affected

ProductAffectedFixed inSource
wolfSSL5.8.0 – 5.9.1–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
wolfSSL (CNA)2.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

patchgithub.com/wolfSSL/wolfssl/pull/10327refwolfssl.com/docs/security-vulnerabilities