What is CVE-2026-42946?

CVE-2026-42946 is a medium-severity vulnerability in F5 Nginx Open Source, classified under CWE-789. CVSS score: 6.5/10. Published 2026-05-13.

How severe is CVE-2026-42946?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in F5 Nginx Open Source

CVE-2026-42946

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-i…

EPSS: 0.001 (21.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L.

Affected products

F5 Nginx Open Source — versions 1.31.0, 0.8.42
F5 Nginx Plus — versions R37, R36, R32

Weakness classification (CWE)

CWE-789
CWE-823

References

f5sirt@f5.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-42946?: CVE-2026-42946 is a medium-severity vulnerability in F5 Nginx Open Source, classified under CWE-789. CVSS score: 6.5/10. Published 2026-05-13.
How severe is CVE-2026-42946?: Medium severity. CVSS v3 base score is 6.5 out of 10.