CVE-2026-42945
Estado: ModificadaCrítica (9.2)—
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.
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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
- Versión: 4.0
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Puntuación base: 9.2
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 3.40%
- Percentil entre todas las CVEs puntuadas: 88
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 % - Impacto secundario
T1499.004Application or System Exploitationimpact80 %
Vulnerabilidad en módulo rewrite de NGINX remoto sin autenticación (AV:N, PR:N, UI:N) explotable mediante HTTP; heap buffer overflow permite ejecución de código o denegación de servicio del proceso worker.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (7)
CWE
- CWE-122
- CWE-131
Referencias
- https://my.f5.com/manage/s/article/K000161019
- https://depthfirst.com/nginx-rift
- https://github.com/DepthFirstDisclosures/Nginx-Rift
- https://access.redhat.com/errata/RHSA-2026:17417
- https://access.redhat.com/errata/RHSA-2026:17751
- https://access.redhat.com/errata/RHSA-2026:17752
- https://access.redhat.com/errata/RHSA-2026:17753
- https://access.redhat.com/errata/RHSA-2026:17790
- https://access.redhat.com/errata/RHSA-2026:17791
- https://access.redhat.com/errata/RHSA-2026:17792
- https://access.redhat.com/errata/RHSA-2026:17793
- https://access.redhat.com/errata/RHSA-2026:17794
- https://access.redhat.com/errata/RHSA-2026:18029
- https://access.redhat.com/errata/RHSA-2026:18041
- https://access.redhat.com/errata/RHSA-2026:18063
- https://access.redhat.com/errata/RHSA-2026:19159
- https://access.redhat.com/errata/RHSA-2026:19371
- https://access.redhat.com/errata/RHSA-2026:19372
- https://access.redhat.com/errata/RHSA-2026:19374
- https://access.redhat.com/errata/RHSA-2026:20442
- https://access.redhat.com/errata/RHSA-2026:20444
- https://access.redhat.com/errata/RHSA-2026:21275
- https://access.redhat.com/errata/RHSA-2026:22382
- https://access.redhat.com/errata/RHSA-2026:22383
- https://access.redhat.com/errata/RHSA-2026:22388
- https://access.redhat.com/errata/RHSA-2026:22389
- https://access.redhat.com/errata/RHSA-2026:22390
- https://access.redhat.com/errata/RHSA-2026:22393
- https://access.redhat.com/errata/RHSA-2026:22394
- https://access.redhat.com/errata/RHSA-2026:22396
- https://access.redhat.com/errata/RHSA-2026:58981
- https://access.redhat.com/security/cve/CVE-2026-42945
- https://bugzilla.redhat.com/show_bug.cgi?id=2477116
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42945.json
JSON original (NVD)
Mostrar
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