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CVE-2026-15176— NGINX ngx_http_core_module vulnerability

Quick assessment

Affected
F5 NGINX Plus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NGINX Plus 和 NGINX Open Source 存在一个漏洞，当配置一个使用 指令并结合 以及引用 变量的 或 指令时，可能会触发该问题。此外，如果在访问日志格式指令中使用了 变量，同样可能导致相同的问题。未经身份验证的攻击者可以通过发送精心构造的 HTTP 请求来利用此漏洞，尽管这可能需要一些超出其控制范围的条件。这种漏洞可能导致 NGINX 工作进程中的堆缓冲区溢出，从而引发进程重启。此外，如果系统的地址空间布局随机化（ASLR）功能被禁用，或者攻击者能够绕过 ASLR，他们甚至可能执行恶意代码。

CVSS 8.1 · High EPSS 0.52% · P43

Affected Version Matrix 8

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.31.0< 1.31.7 affected
0.1.29< 1.30.6 affected
F5 NGINX Plus 37.1.0< 37.1.0.1 affected
37.0.0< 37.0.5.1 affected
R36< * affected
R35< * affected
R34< * affected
R33< * affected
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I. Basic Information for CVE-2026-15176

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_core_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 NGINX Plus 37.1.0 ~ 37.1.0.1 -
F5 NGINX Open Source 1.31.0 ~ 1.31.7 -

II. Public POCs for CVE-2026-15176

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III. Intelligence Information for CVE-2026-15176

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Other References for CVE-2026-15176 (1)

Same Patch Batch · F5 · 2026-10-14 · 11 CVEs total

CVE-2026-91184 8.8 HIGH NGINX Gateway Fabric vulnerability
CVE-2026-93479 8.1 HIGH NGINX map directive and regex matching vulnerability
CVE-2026-97205 8.1 HIGH NGINX ngx_http_core_module vulnerability
CVE-2026-94197 7.5 HIGH NGINX Ingress Controller vulnerability
CVE-2026-104939 7.5 HIGH NGINX Ingress Controller vulnerability
CVE-2026-101019 6.5 MEDIUM NGINX ngx_http_js_module vulnerability
CVE-2026-96615 6.5 MEDIUM NGINX Gateway Fabric vulnerability
CVE-2026-97629 6.5 MEDIUM NGINX ngx_http_ssl_module vulnerability
CVE-2026-95101 5.3 MEDIUM NGINX ngx_http_v3_module vulnerability
CVE-2026-101025 5.3 MEDIUM NGINX ngx_http_js_module vulnerability

IV. Related Vulnerabilities

Same product: NGINX Plus
Same vendor: F5
Same weakness: CWE-122

V. Comments for CVE-2026-15176

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