MSRXCVE-2026-15176
CVE-2026-15176
NGINX ngx_http_core_module vulnerability
CVSS 4.0 · CNA · f5.com
chance of exploitation in the next 30 days (EPSS; higher than 57% of CVEs)
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.
Scores
Affected products
- F5 NGINX Plus: 37.1.0 to < 37.1.0.1; 37.0.0 to < 37.0.5.1; R36 to < *; R35 to < *; R34 to < *; R33 to < *
- F5 NGINX Open Source: 1.31.0 to < 1.31.7; 0.1.29 to < 1.30.6
Weakness: CWE-122
1 references (advisories, patches, write-ups)
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.