CVE-2026-42945
Full vulnerability record from the local CVENow database.
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.
Severity
CRITICAL
CVSS score
9.2
(v4.0)
Vulnerability status
Modified
Source identifier
Published
2026-05-13 16:16:50.190000
Last modified
2026-10-26 14:10:00.130000
View original CVE JSON
{
"id": "CVE-2026-42945",
"sourceIdentifier": "[email protected]",
"published": "2026-05-13T16:16:50.190",
"lastModified": "2026-10-26T14:10:00.130",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "NGINX Plus y NGINX Open Source tienen una vulnerabilidad en el módulo ngx_http_rewrite_module. Esta vulnerabilidad existe cuando la directiva rewrite es seguida por una directiva rewrite, if o set y una captura de Expresión Regular Compatible con Perl (PCRE) sin nombre (por ejemplo, $1, $2) con una cadena de reemplazo que incluye un signo de interrogación (?). Un atacante no autenticado, junto con condiciones fuera de su control, puede explotar esta vulnerabilidad enviando solicitudes HTTP manipuladas. Esto puede causar un desbordamiento de búfer de pila en el proceso de trabajo de NGINX, lo que lleva a un reinicio. Además, para sistemas con la Aleatorización del Espacio de Direcciones (ASLR) deshabilitada, es posible la ejecución de código. Nota: Las versiones de software que han alcanzado el Fin del Soporte Técnico (EoTS) no son evaluadas."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
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