CVE-2026-42946

NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability

HIGH
7.4
CVSS Score
Published: May 13, 2026 at 02:12 PM UTC
Updated: October 26, 2026 at 02:10 PM UTC
7 products affected across 1 vendorNGINX PlusNGINX Open SourceNGINX Ingress Controller

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Severity
HIGH7.4
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

4.3.0 ≤ v ≤ 4.7.04.8.0
1.3.0 ≤ v ≤ 1.6.22.0.0 ≤ v ≤ 2.6.0
3.5.0 ≤ v ≤ 3.7.24.0.0 ≤ v ≤ 4.0.15.0.0 ≤ v ≤ 5.4.2
2.16.0 ≤ v ≤ 2.22.0
0.8.42 ≤ v ≤ 0.9.71.0.0 ≤ v ≤ 1.30.00.8.42
Affected range stops below 1.30.1, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 1.31.0 (unaffected)
r32 ≤ v ≤ r36R32R36
Affected range stops below R32 P6, so it looks safe — our inference, not a vendor statement
Affected range stops below R36 P4, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in R37 (unaffected)
4.9.0 ≤ v ≤ 4.16.05.1.0 ≤ v ≤ 5.8.05.9.0 ≤ v ≤ 5.12.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

Vendor AdvisoryPatchMitigation
Source: cverecord
https://my.f5.com/manage/s/article/K000161027

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-789CWE-823

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