CVE-2026-9256
Gravedad CVSS v4.0:
CRÍTICA
Tipo:
CWE-122
Desbordamiento de búfer basado en memoria dinámica (Heap)
Fecha de publicación:
22/05/2026
Última modificación:
30/06/2026
Descripción
*** Pendiente de traducción *** 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. <br />
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Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Impacto
Puntuación base 4.0
9.20
Gravedad 4.0
CRÍTICA
Puntuación base 3.x
8.10
Gravedad 3.x
ALTA
Productos y versiones vulnerables
| CPE | Desde | Hasta |
|---|---|---|
| cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* | 0.1.17 (incluyendo) | 0.9.7 (incluyendo) |
| cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* | 1.0.0 (incluyendo) | 1.30.1 (incluyendo) |
| cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:* | ||
| cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* | 37.0.0 (incluyendo) | 37.0.1.1 (excluyendo) |
| cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* | r32 (incluyendo) | r36 (incluyendo) |
Para consultar la lista completa de nombres de CPE con productos y versiones, ver esta página
Referencias a soluciones, herramientas e información
- https://my.f5.com/manage/s/article/K000161377
- http://www.openwall.com/lists/oss-security/2026/05/22/14
- https://lists.debian.org/debian-lts-announce/2026/06/msg00023.html
- https://access.redhat.com/errata/RHSA-2026:20351
- https://access.redhat.com/errata/RHSA-2026:28212
- https://access.redhat.com/errata/RHSA-2026:28921
- https://access.redhat.com/errata/RHSA-2026:28973
- https://access.redhat.com/errata/RHSA-2026:29151
- https://access.redhat.com/errata/RHSA-2026:29874
- https://access.redhat.com/errata/RHSA-2026:33313
- https://access.redhat.com/security/cve/CVE-2026-9256
- https://bugzilla.redhat.com/show_bug.cgi?id=2480746
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9256.json



