High 8.1Published Oct 14, 2026

CVE-2026-93479NGINX map directive and regex matching vulnerability

Updated under an hour ago (2026-10-19 05:50 UTC)

Does this affect you?

It affects F5 NGINX Plus and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.55%, higher than 45% of scored CVEs.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for F5 NGINX Plus

Exploited in the last 30 days

A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.55% (percentile 45)
Assigned by: f5
NVD analysis: Awaiting Analysis
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

F5 NGINX Plus f5:nginx_plus (from the name)	from 37.1.0 before 37.1.0.1; from 37.0.0 before 37.0.5.1; from R36; from R35; from R34; from R33	CNA record
F5 NGINX Open Source f5:nginx_open_source (from the name)	from 1.31.2 before 1.31.7; from 1.30.0 before 1.30.6	CNA record

References

https://my.f5.com/manage/s/article/K000162607vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.