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CVE-2026-78689— NGINX ngx_http_js_module vulnerablility

Quick assessment

Affected
F5 NGINX JavaScript
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.

F5 NGINX JavaScript是美国F5公司的一个嵌入式JavaScript脚本语言。 F5 NGINX JavaScript 0.7.10版本至1.0.1之前版本存在缓冲区错误漏洞，该漏洞源于XML模块的命名空间前缀列表解析器在处理特制的XML命名空间前缀列表时存在越界写入，可能导致拒绝服务或执行任意代码。

CVSS 8.1 · High EPSS 0.76% · P54

Affected Version Matrix 1

VendorProduct Version RangeStatus
F5 NGINX JavaScript 0.7.10< 1.0.1 affected
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I. Basic Information for CVE-2026-78689

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_js_module vulnerablility
Source: CVE Program / CVE List V5
Vulnerability Description
Description NGINX JavaScript (njs) has a vulnerability in the XML module's namespace prefix list parser, reachable through the xml.exclusiveC14n() method. An unauthenticated remote attacker can trigger it when an affected NGINX configuration passes an externally controlled XML namespace prefix list to that method. Both the njs and the QuickJS (qjs) engines are affected. A crafted prefix list causes an out-of-bounds write past the end of a heap allocation. With the njs engine, which is the engine used when the js_engine directive is absent, this corrupts adjacent objects and crashes the NGINX worker. With the QuickJS engine, the same call additionally leaks the prefix list on every invocation, causing worker memory to grow across requests. The official nginxinc/nginx-saml reference implementation is affected during SAML signature verification. It reads InclusiveNamespaces/@PrefixList from an untrusted SAML message and passes it to xml.exclusiveC14n() before the signature has been verified, so a valid SAML signature is not required. A crafted SAML Response, Assertion, LogoutRequest, or LogoutResponse is sufficient. Code execution has not been demonstrated and cannot be ruled out for all platforms, as the effect of the out-of-bounds write depends on conditions beyond the attacker's control.   Impact This vulnerability allows remote attackers to cause a denial of service on the NGINX system, either through repeatable worker restarts or through worker memory growth or possibly trigger 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
Vulnerability Title
F5 NGINX JavaScript 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 NGINX JavaScript是美国F5公司的一个嵌入式JavaScript脚本语言。 F5 NGINX JavaScript 0.7.10版本至1.0.1之前版本存在缓冲区错误漏洞，该漏洞源于XML模块的命名空间前缀列表解析器在处理特制的XML命名空间前缀列表时存在越界写入，可能导致拒绝服务或执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 NGINX JavaScript 0.7.10 ~ 1.0.1 -

II. Public POCs for CVE-2026-78689

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III. Intelligence Information for CVE-2026-78689

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Vendor Advisories for CVE-2026-78689 (1)

Same Patch Batch · F5 · 2026-09-02 · 7 CVEs total

CVE-2026-66842 8.8 HIGH BIG-IP and BIG-IQ Configuration utility vulnerability
CVE-2026-77180 8.3 HIGH NGINX Ingress Controller vulnerability
CVE-2026-18329 8.2 HIGH NGINX ngx_http_js_module vulnerability
CVE-2026-66362 8.1 HIGH NGF vulnerability
CVE-2026-78222 7.5 HIGH NGINX ngx_http_js_module vulnerability
CVE-2026-63020 3.1 LOW BIG-IP Configuration utility vulnerability

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-78689

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