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CVE-2026-42945

9.2 critical exploit ×47 SSVC exploitation: none Modified
NVD · CVE.org

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.

Fix

Public exploits 47

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.2 · f5NVD modified 2026-10-26 14:10

Affected (CPE criteria) 8

  • cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*
  • cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*

References 34