Use-After-Free Vulnerability in wolfSSL Products
CVE-2026-7531

2.3LOW

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
25 June 2026

What is CVE-2026-7531?

A use-after-free vulnerability in wolfSSL's handling of PQC hybrid key-share can lead to security risks. This issue arises in the context of TLS 1.3 when a malicious server sends a truncated PQC hybrid KeyShare, which may cause the error cleanup path to operate on already freed memory. This vulnerability is part of an incomplete-fix follow-up to a previous issue, emphasizing the need for timely updates to mitigate potential exploits.

Affected Version(s)

wolfSSL 5.8.0 <= 5.9.1

References

https://github.com/wolfSSL/wolfssl/pull/10327
patch
https://www.wolfssl.com/docs/security-vulnerabilities/

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thai Duong (Calif.io / Anthropic)
.