F5 NGINX Plus/NGINX Open Source ngx_http_v3_module injection

Summaryinfo

A vulnerability classified as problematic has been found in F5 NGINX Plus and NGINX Open Source. This issue affects some unknown processing of the component ngx_http_v3_module. This manipulation causes injection. The identification of this vulnerability is CVE-2026-95101. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in F5 NGINX Plus and NGINX Open Source (version now known). It has been declared as problematic. Affected by this vulnerability is some unknown processing of the component ngx_http_v3_module. The manipulation with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect integrity. The summary by CVE is:

Description NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with proxy_request_buffering on directive, an unauthenticated attacker may be able to inject data in the proxied request. Impact This vulnerability may allow remote attackers to inject data in the proxied request.  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.

The advisory is shared at my.f5.com. This vulnerability is known as CVE-2026-95101 since 09/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/14/2026). MITRE ATT&CK project uses the attack technique T1055 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Web Server

Vendor

• F5

Name

• NGINX Open Source
• NGINX Plus

License

• commercial

Website

• Vendor: https://f5.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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