High 8.1Published Oct 14, 2026

CVE-2026-15176NGINX ngx_http_core_module vulnerability

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

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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 0.52%, higher than 43% of scored CVEs.

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Every CVE for F5 NGINX Plus

Exploited in the last 30 days

A vulnerability exists in NGINX Plus and NGINX Open Source when a location is configured that uses the alias directive together with rewrite and a set or return directive referencing the $request_filename variable. Alternatively, the same result could be achieved when the $request_filename variable is used in an access log format directive. 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): 0.52% (percentile 43)
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 1.31.0 before 1.31.7; from 0.1.29 before 1.30.6	CNA record

References

https://my.f5.com/manage/s/article/K000162416vendor-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.