CVE-2026-18329
NGINX njs/QuickJS bug can fail-open js_access, allowing auth bypass via crafted HTTP requests
Is CVE-2026-18329 being exploited?
Not confirmed. CVE-2026-18329 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 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2026-18329?
CVE-2026-18329 is rated High with a CVSS score of 8.8. 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-2026-18329?
Yes. A fix has been recorded for CVE-2026-18329. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-18329 affect?
CVE-2026-18329 affects NGINX JavaScript (njs), QuickJS (qjs), NGINX instances using js_access handlers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18329?
Apply vendor patch/update njs/qjs; disable or restrict js_access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can bypass js_access auth/authorization checks via crafted HTTP requests that trigger async js_access errors.
Immediate action required
- affected>= 1.0.0 and < 1.0.1
- affected>= 0.9.9 and < *
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.