CVE-2026-9256

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.
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:37.0.0.1:*:*:*:long-term_support:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:-:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p5:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r32:p6:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:*

Configuration 2 (hide)

OR cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*

Configuration 3 (hide)

OR cpe:2.3:a:redhat:discovery:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:update_infrastructure:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-22 15:16

Updated : 2026-08-25 13:19


NVD link : CVE-2026-9256

Mitre link : CVE-2026-9256

CVE.ORG link : CVE-2026-9256


JSON object : View

Products Affected

redhat

  • enterprise_linux
  • discovery
  • hardened_images
  • update_infrastructure

f5

  • nginx_open_source
  • nginx_ingress_controller
  • nginx_plus
  • waf
  • nginx_instance_manager
  • dos
  • nginx_gateway_fabric

debian

  • debian_linux
CWE
CWE-122

Heap-based Buffer Overflow