CVE-2026-42945
NGINX ngx_http_rewrite_module vulnerability
Description
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, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS Vector Breakdown
AV:NAttack VectorAC:HAttack ComplexityPR:NPrivileges RequiredUI:NUser InteractionS:UScopeC:HConfidentialityI:HIntegrityA:HAvailabilityWeaknesses
Affected Products
Exploitability
Attack Graph
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
2 techniquesReferences
- Critical NGINX Vulnerability Can Crash Workers and May Allow Remote Code Executionen·The Hacker News· Patch NGINX Ingress Controller rce
- В NGINX исправили сразу две критические RCE-уязвимостиru-ru·Хакер (xakep.ru)· Patch NGINX Open Source rce
- F5 Patches Two Critical NGINX Open Source Flaws Enabling Remote Code Executionen·The Hacker News· Research ESET Gentlemen
- В фокусе RVD: трендовые уязвимости маяru·Хабр — Информационная безопасность· Exploited PAN-OS rce
- 18th May – Threat Intelligence Reporten-us·Check Point Research· Exploited Lapsus$ ransomware
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