Medium 6.5Published May 13, 2026

CVE-2026-42946NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability

Updated under an hour ago (Oct 26, 2026, 4:40 PM ET)

Does this affect you?

It affects F5 NGINX Plus and 6 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for F5 NGINX Plus

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L
Weakness (CWE): CWE-789, CWE-823
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: f5
NVD analysis: Analyzed
Record last updated: May 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

F5 NGINX Plus f5:nginx_plus (from the name)	from R37 not affected; from R36 before R36 P4; from R32 before R32 P6	CNA record
F5 NGINX Open Source f5:nginx_open_source (from the name)	from 1.31.0 not affected; from 0.8.42 before 1.30.1	CNA record
f5 dos f5:dos	from 4.3.0 through 4.7.0; 4.8.0	NVD
f5 nginx_gateway_fabric f5:nginx_gateway_fabric	from 1.3.0 through 1.6.2; from 2.0.0 through 2.6.0	NVD
f5 nginx_ingress_controller f5:nginx_ingress_controller	from 3.5.0 through 3.7.2; from 4.0.0 through 4.0.1; from 5.0.0 through 5.4.2	NVD
f5 nginx_instance_manager f5:nginx_instance_manager	from 2.16.0 through 2.22.0	NVD
f5 nginx_open_source f5:nginx_open_source	from 0.8.42 through 0.9.7; from 1.0.0 through 1.30.0	NVD
f5 nginx_plus f5:nginx_plus	from r32 through r36	NVD
f5 waf f5:waf	from 4.9.0 through 4.16.0; from 5.1.0 through 5.8.0; from 5.9.0 through 5.12.1	NVD

References

References

https://my.f5.com/manage/s/article/K000161027	vendor-advisory, patch, mitigation

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.