NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its 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
Configuration 1 (hide)
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History
26 Oct 2026, 14:10
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Information
Published : 2026-05-13 16:16
Updated : 2026-10-26 14:10
NVD link : CVE-2026-42945
Mitre link : CVE-2026-42945
CVE.ORG link : CVE-2026-42945
JSON object : View
Products Affected
f5
- nginx_plus
- nginx_ingress_controller
- nginx_instance_manager
- nginx_gateway_fabric
- nginx_open_source
- waf
- dos
