CVE-2026-7531 — CRITICAL (9.8)

Q: How severe is CVE-2026-7531?

CVE-2026-7531 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-7531?

Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.

Vulnerability Description

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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Wolfssl	Wolfssl	>= 5.8.0, < 5.9.2

Related Weaknesses (CWE)

CWE-416

References

https://github.com/wolfSSL/wolfssl/pull/10327Issue TrackingPatch
https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory

FAQ

What is CVE-2026-7531?

CVE-2026-7531 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...

How severe is CVE-2026-7531?

CVE-2026-7531 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-7531?

Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.