Widely-used Hot Chocolate GraphQL server; unbounded recursion causes DoS via stack overflow across many deployments.
CVE-2026-40324
Critical stack overflow in Hot Chocolate GraphQL parser can crash workers.
Is CVE-2026-40324 being exploited?
Not confirmed. CVE-2026-40324 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.90% probability of exploitation in the next 30 days.
How severe is CVE-2026-40324?
CVE-2026-40324 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-40324?
Yes. A fix has been recorded for CVE-2026-40324. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40324 affect?
CVE-2026-40324 affects Hot Chocolate GraphQL server (pre-patch 12.22.7, 13.9.16, 14.3.1, 15.1.14). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40324?
Upgrade to patched releases with safe recursion limits
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
StackOverflowException via crafted payload; crashes worker process, drops in-flight requests, causing downtime.
Patch when possible
- affected< 12.22.7
- affected>= 13.0.0 and < 13.9.16
- affected>= 14.0.0 and < 14.3.1
- affected>= 15.0.0 and < 15.1.14
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.