CVE-2026-42946
Last modified
CVE-2026-42946 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Dos | >= 4.3.0, <= 4.7.0 |
| F5 | Dos | 4.8.0 |
| F5 | Nginx Gateway Fabric | >= 1.3.0, <= 1.6.2 |
| F5 | Nginx Gateway Fabric | >= 2.0.0, <= 2.6.0 |
| F5 | Nginx Ingress Controller | >= 3.5.0, <= 3.7.2 |
| F5 | Nginx Ingress Controller | >= 4.0.0, <= 4.0.1 |
| F5 | Nginx Ingress Controller | >= 5.0.0, <= 5.4.2 |
| F5 | Nginx Instance Manager | >= 2.16.0, <= 2.22.0 |
| F5 | Nginx Open Source | >= 0.8.42, <= 0.9.7 |
| F5 | Nginx Open Source | >= 1.0.0, <= 1.30.0 |
| F5 | Nginx Plus | >= r32, <= r36 |
| F5 | Waf | >= 4.9.0, <= 4.16.0 |
| F5 | Waf | >= 5.1.0, <= 5.8.0 |
| F5 | Waf | >= 5.9.0, <= 5.12.1 |
References
- https://my.f5.com/manage/s/article/K000161027Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-42946?
How severe is CVE-2026-42946?
How do I fix CVE-2026-42946?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-42934NGINX Plus and NGINX Open Source have a vulnerability in the…6.3
- CVE-2026-42936The installer of HYPER SBI 2 insecurely loads Dynamic Link L…8.4
- CVE-2026-42937Incorrect permission assignment vulnerabilities exist in BIG…7.1
- CVE-2026-42941The Danelec MacGregor Voyage Data Recorder device includes …8.7
- CVE-2026-42944NLnet Labs Unbound 1.14.0 up to and including version 1.25.0…7.5
- CVE-2026-42945NGINX Plus and NGINX Open Source have a vulnerability in the…9.2
- CVE-2026-42947A flaw in Naxclow's platform’s onboarding workflow allows an…8.8
- CVE-2026-42948Stored cross-site scripting vulnerability exists in ELECOM w…4.8
- CVE-2026-4295Improper trust boundary enforcement in Kiro IDE before versi…8.5
- CVE-2026-42950ELECOM wireless LAN access point devices do not check if lan…5.1
- CVE-2026-42951An authenticated user can download a backup of the Danelec M…5.9
- CVE-2026-42952Previously, there was no throttling on repeated authenticati…8.7
Are you affected by CVE-2026-42946?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST