CVE-2026-9256 NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| NGINX Plus 37.0 | 37.0 → < 37.0.1.1 | 37.0.1.1 |
| NGINX Open Source 1.31 | 1.31.0 → < 1.31.1 | 1.31.1 |
| NGINX Open Source 1.30 | 1.30.0 → < 1.30.2 | 1.30.2 |
| NGINX Open Source 0.1 | 0.1.17 → 0.9.7 | No fix stated |
| Red Hat Enterprise Linux AppStream (v. 10) | Versions not published | |
| Red Hat Enterprise Linux AppStream (v. 8) | Versions not published | |
| Red Hat Enterprise Linux AppStream (v. 9) | Versions not published | |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Versions not published | |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Versions not published |
Show the 7 other branches Hide the 7 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Discovery 2 1782756541 | earliest → < 1782756541 | 1782756541 |
| Red Hat Hardened Images 1.30 | earliest → < 1.30.2-1.hum1 | 1.30.2-1.hum1 |
| Red Hat Lightspeed proxy 1 | Versions not published | |
| Red Hat Enterprise Linux 10 | Versions not published | |
| Red Hat Enterprise Linux 8 8100020260611094050.489197 | earliest → < 8100020260611094050.489197e6 | 8100020260611094050.489197e6 |
| Red Hat Enterprise Linux 9 9080020260609152155.9 | earliest → < 9080020260609152155.9 | 9080020260609152155.9 |
| Red Hat Update Infrastructure 5 1787241260 | earliest → < 1787241260 | 1787241260 |
References
- my.f5.com my.f5.com
Timeline
- Published
- Last modified