CVE-2026-95101: CWE-172 in F5 NGINX Plus
Description
CVE-2026-95101 is a medium severity vulnerability in F5 NGINX Plus and NGINX Open Source affecting the ngx_http_v3_module. When HTTP/3 is used with the proxy_request_buffering directive enabled, an unauthenticated attacker may inject data into proxied requests. This vulnerability impacts the data plane only and does not expose the control plane. Multiple versions of NGINX Plus and Open Source are affected, including versions from 1.25.0 and various release branches up to but not including fixed versions. There is no indication of known exploits in the wild. No patch links are provided, and the patch status is not confirmed.
CVSS v3.1
Score 5.3medium
Affected software
F5
NGINX Plus
F5
NGINX Open Source
pkg:rpm/f5/nginx-plusRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-95101 affects the ngx_http_v3_module in F5 NGINX Plus and NGINX Open Source. It allows unauthenticated remote attackers to inject data into proxied requests when HTTP/3 is used with the proxy_request_buffering directive enabled. This is a data plane vulnerability without control plane exposure. The affected versions include multiple release branches and specific version ranges starting from 1.25.0 up to but excluding certain fixed versions (e.g., >=37.1.0 <37.2.0.1, >=37.0.0 <37.0.7.1, >=1.31.0 <1.31.7, >=1.30.0 <1.30.6). The CVSS v3.1 base score is 5.3, indicating medium severity, with no confidentiality or availability impact but an integrity impact due to possible data injection.
Potential Impact
Remote unauthenticated attackers may inject data into proxied HTTP/3 requests when proxy_request_buffering is enabled. This could lead to integrity issues in the proxied request data. There is no impact on confidentiality or availability, and the control plane is not exposed. The vulnerability affects the data plane only.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider disabling HTTP/3 or the proxy_request_buffering directive as a temporary mitigation if feasible. Monitor vendor communications for patches or updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- f5
- Date Reserved
- 2026-09-30T17:31:09.137Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acf966f2cdf04f6568bce0d
Added to database: 10/14/2026, 14:49:19 UTC
Last enriched: 10/14/2026, 15:03:55 UTC
Last updated: 10/14/2026, 15:08:16 UTC
Views: 6
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