Riskcovery

CVE-2026-15176

NGINX ngx_http_core_module vulnerability

State
Published
Severity
9.2 Critical
Published
Oct 14, 2026
Updated
Oct 15, 2026
Reserved
Jul 8, 2026

Read the record on cve.org

Description

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

CVSSScoreVectorSource
4.09.2 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:Nf5
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hf5

Weaknesses

Affected Products

ProductVersions
NGINX PlusF5
  • 37.1.0 to before 37.1.0.1Affected
  • 37.0.0 to before 37.0.5.1Affected
  • R36 and laterAffected
  • R35 and laterAffected
  • R34 and laterAffected
  • R33 and laterAffected
NGINX Open SourceF5
  • 1.31.0 to before 1.31.7Affected
  • 0.1.29 to before 1.30.6Affected

References

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