CVE-2026-7531
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.
CSIRTS triage
- What
- Use-after-free vulnerability in PQC hybrid key-share handling.
- Who is affected
- Deployments using the affected PQC hybrid key-share handling are at risk.
- Urgency
- Remediation is critical due to the high severity of the vulnerability.
- Action
- Update to the patched version as soon as it is available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-7531: Use-after-free in PQC hybrid key-share handling. This is an incomplete-fix follow-up to CVE-202…nvd · 2026-06-25
- criticalCVE-2026-7531: Use-after-free in PQC hybrid key-share handlingmsrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-7531)