CVE-2026-42946

NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability

State: Published
Severity: 8.3 High
Published: May 13, 2026
Updated: May 13, 2026
Reserved: Apr 30, 2026

Description

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Scores

CVSS	Score	Vector	Source
4.0	8.3 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N	f5
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L	f5

Weaknesses

CWE-789 Memory Allocation with Excessive Size Value
CWE-823 Use of Out-of-range Pointer Offset

Affected Products

Product	Versions
NGINX PlusF5	R37 and laterNot affected R36 to before R36 P4Affected R32 to before R32 P6Affected
NGINX Open SourceF5	1.31.0 and laterNot affected 0.8.42 to before 1.30.1Affected

References

https://my.f5.com/manage/s/article/K000161027vendor-advisorypatch

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