CVE-2026-42946
NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability
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.
INFO
Published Date :
May 13, 2026, 4:16 p.m.
Last Modified :
May 13, 2026, 4:27 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 9dacffd4-cb11-413f-8451-fbbfd4ddc0ab | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 9dacffd4-cb11-413f-8451-fbbfd4ddc0ab | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update NGINX to a version that addresses the vulnerability.
- Ensure scgi_pass and uwsgi_pass configurations are reviewed.
- Mitigate MITM risks by securing network communications.
Public PoC/Exploit Available at Github
CVE-2026-42946 has a 14 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42946.
| URL | Resource |
|---|---|
| https://my.f5.com/manage/s/article/K000161027 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42946 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42946
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
CVE-2026-42945 turns a 17-year-old NGINX rewrite bug into remote code execution — even with ASLR on, by chaining the heap overflow with live worker memory read through a common file-read flaw.
Python
None
None
Dockerfile Makefile Python HTML Shell
PoC for CVE-2026-42945 (nginx Rift) — heap buffer overflow in ngx_http_rewrite_module. Includes detect/probe/exploit modes, dual-fixture Docker lab, empirical address discovery, OOB-verified offset sweep. Original disclosure by depthfirst.
buffer-overflow cve cve-2026-42945 exploit-development heap-overflow nginx poc rce security-research nginx-exploit
Python Shell
Private Nginx Rift ASLR lab, exploit chain, and demo recordings
Python GDB Shell
nginx CVE scanner + RCE exploit framework (CVE-2026-42945 + 16 others)
Python
None
Shell
Trigger-aware web server CVE audit for nginx and Apache. Goes beyond version matching by checking whether the vulnerable code path is actually reachable in your configuration. Classifies findings as Active / Latent / Unverified. Single-file Python 3.5+, no dependencies.
Python
None
Python Shell
Private Nginx Rift ASLR lab, exploit chain, and demo recordings
Python GDB Shell
None
Python Shell
exploit for CVE-2026-42945
Shell Python
WNMP One‑Click Stack | WebDAV · Nginx · PHP · MariaDB · Kernel Tuning
Shell
使用Google Gemini API，对hacker news Top100文章总结摘要并翻译成体中文，每日自动更新。
ai gemini hacker-news hackernews summarizer
Ruby Shell Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42946 vulnerability anywhere in the article.
-
TheCyberThrone
CVE-2026-42945 — NGINX Heap Buffer Overflow RCE
CVE: CVE-2026-42945CVSS: 9.2 — CriticalVendor: NGINX / F5Affected Versions: 0.6.27 through 1.30.0Vulnerability Type: Heap Buffer OverflowImpact: Unauthenticated Remote Code ExecutionPoC Available: Yes ... Read more
-
Daily CyberSecurity
Nginx Releases Critical Update: Six Vulnerabilities Patched in New Stable Version
The web infrastructure world received a major wake-up call today as nginx-1.30.1 was released to address a suite of six security vulnerabilities. These flaws range from high-severity arbitrary code ex ... Read more
-
CybersecurityNews
Critical 18-Year-Old NGINX Vulnerability Enables Remote Code Execution Attacks
A critical heap buffer overflow vulnerability has been discovered in the source code of NGINX, present since 2008. This vulnerability has been publicly disclosed, along with a working proof-of-concept ... Read more
-
The Hacker News
18-Year-Old NGINX Rewrite Module Flaw Enables Unauthenticated RCE
Cybersecurity researchers have disclosed multiple security vulnerabilities impacting NGINX Plus and NGINX Open, including a critical flaw that remained undetected for 18 years. The vulnerability, disc ... Read more
The following table lists the changes that have been made to the
CVE-2026-42946 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
May. 13, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L Added CWE CWE-789 Added CWE CWE-823 Added Reference https://my.f5.com/manage/s/article/K000161027