CVE-2026-9256— NGINX ngx_http_rewrite_module vulnerability
Possible ATT&CK Techniques 2AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| F5 | NGINX Open Source | 1.31.0< 1.31.1 | affected |
1.30.0< 1.30.2 | affected | ||
0.1.17< * | affected | ||
| F5 | NGINX Plus | 37.0< 37.0.1.1 | affected |
R36< R36 P5 | affected | ||
R32< R32 P7 | affected |
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I. Basic Information for CVE-2026-9256
Vulnerability Information
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Vulnerability Title
NGINX ngx_http_rewrite_module vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| F5 | NGINX Plus | 37.0 ~ 37.0.1.1 | - | |
| F5 | NGINX Open Source | 1.31.0 ~ 1.31.1 | - |
II. Public POCs for CVE-2026-9256
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
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- https://my.f5.com/manage/s/article/K000161377vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-9256
IV. Related Vulnerabilities
V. Comments for CVE-2026-9256
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