F5 NGINX Plus/NGINX Open Source ngx_http_scgi_module/ngx_http_uwsgi_module memory allocation

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in F5 NGINX Plus and NGINX Open Source. Affected by this vulnerability is an unknown functionality of the component ngx_http_scgi_module/ngx_http_uwsgi_module. The manipulation results in memory allocation. This vulnerability is cataloged as CVE-2026-42946. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in F5 NGINX Plus and NGINX Open Source (version unknown). Affected is an unknown function of the component ngx_http_scgi_module/ngx_http_uwsgi_module. The manipulation with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was shared by Zhenpeng as K000161027. The advisory is available at my.f5.com. This vulnerability is traded as CVE-2026-42946 since 05/01/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 314992 (Fedora 42 : nginx / nginx-mod-brotli / nginx-mod-fancyindex / etc (2026-38623b4fed)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (314992) and CERT Bund (WID-SEC-2026-1527). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • NGINX NGINX Plus
  • NGINX NGINX

Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.4
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory allocation
CWE: CWE-789 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 314992
Nessus Name: Fedora 42 : nginx / nginx-mod-brotli / nginx-mod-fancyindex / etc (2026-38623b4fed)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/01/2026 CVE reserved
05/13/2026 +12 days Advisory disclosed
05/13/2026 +0 days VulDB entry created
06/16/2026 +34 days VulDB entry last update

Sourcesinfo

Vendor: f5.com

Advisory: K000161027
Researcher: Zhenpeng
Status: Confirmed

CVE: CVE-2026-42946 (🔒)
GCVE (CVE): GCVE-0-2026-42946
GCVE (VulDB): GCVE-100-363594
CERT Bund: WID-SEC-2026-1527 - NGINX Open Source and NGINX Plus: Mehrere Schwachstellen

Entryinfo

Created: 05/13/2026 17:51
Updated: 06/16/2026 23:14
Changes: 05/13/2026 17:51 (76), 05/15/2026 21:18 (7), 05/16/2026 10:02 (2), 06/16/2026 23:14 (11)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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