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CVE-2026-93479— NGINX map directive and regex matching 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 中存在一个漏洞。当 指令使用正则表达式匹配，且 指令或访问日志格式在引用 输出的变量之前，就引用了该正则表达式的捕获变量时，就会触发此漏洞。在某些条件下，也可以在字符串表达式中使用不可缓存的变量来达到相同的效果。 未经身份验证的攻击者结合某些其无法控制的条件，可通过发送精心构造的 HTTP 请求来利用该漏洞。这可能导致 NGINX 工作进程（worker process）发生堆缓冲区溢出，进而引发进程重启。此外，在系统禁用地址空间布局随机化（ASLR）或

CVSS 8.1 · High EPSS 0.55% · P45

Affected Version Matrix 8

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.31.2< 1.31.7 affected
1.30.0< 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-2026-93479

Vulnerability Information
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Vulnerability Title
NGINX map directive and regex matching vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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 1.31.2 ~ 1.31.7 -

II. Public POCs for CVE-2026-93479

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III. Intelligence Information for CVE-2026-93479

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Other References for CVE-2026-93479 (1)

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

CVE-2026-91184 8.8 HIGH NGINX Gateway Fabric vulnerability
CVE-2026-15176 8.1 HIGH NGINX ngx_http_core_module 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-2026-93479

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