CVE-2026-7531 Use-after-free in PQC hybrid key-share handling
A malicious TLS server can trigger a use-after-free in wolfSSL's PQC hybrid key-share handling, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-7531?
CVE-2026-7531 is a low-severity use after free vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-416
Which versions are affected by CVE-2026-7531?
It affects 1 product.
Products include Wolfssl Wolfssl.
How do I fix CVE-2026-7531?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-7531 being exploited?
There is no known exploitation of CVE-2026-7531 in the wild and no public exploit code.
Other vulnerabilities in Wolfssl Wolfssl
Sources
Also known as DEBIAN-CVE-2026-7531, GHSA-w9rp-wwm2-fwmr, JLSEC-2026-757, UBUNTU-CVE-2026-7531.