Affects widely deployed NGINX (Open Source + Plus); unauthenticated input can cause DoS and potential RCE — high-impact on web infrastructure.
CVE-2026-93479
Heap overflow in NGINX map regex handling enabling DoS and possible RCE.
Is CVE-2026-93479 being exploited?
Not confirmed. CVE-2026-93479 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 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-93479?
CVE-2026-93479 is rated Critical with a CVSS score of 9.2. 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-2026-93479?
Not known from our data. No patch reference has been recorded for CVE-2026-93479, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-93479 affect?
CVE-2026-93479 affects NGINX Open Source, NGINX Plus, NGINX worker processes. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-93479?
Apply vendor fix/mitigation ASAP; restrict ingress, update WAF rules, monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated crafted HTTP requests can trigger a heap buffer overflow in NGINX workers, causing process restart (DoS) and potential remote code execution if ASLR is bypassed or disabled.
Immediate action required
- affected>= 1.31.2 and < 1.31.7
- affected>= 1.30.0 and < 1.30.6
- affected>= 37.1.0 and < 37.1.0.1
- affected>= 37.0.0 and < 37.0.5.1
- affected>= R36 and < *
- affected>= R35 and < *
- affected>= R34 and < *
- affected>= R33 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.