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.
References
Configurations
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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
