CVE-2026-42055
Estado: ModificadaCrítica (9.2)—
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based 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.
Leer descripción completaMostrar menos
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:P/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: 6.54%
- Percentil entre todas las CVEs puntuadas: 94
- Fecha de la puntuación: 6/10/2026
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 Exploitationimpact70 %
Vulnerabilidad en módulos de NGINX accesible remotamente sin autenticación (AV:N, PR:N). Heap overflow permite ejecución de código o DoS del worker process. ASLR deshabilitado facilita RCE; condiciones adversas apuntan a complejidad en explotación.
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 (11)
CWE
- CWE-122
- CWE-787
- CWE-131
Referencias
- https://my.f5.com/manage/s/article/K000161584
- https://access.redhat.com/errata/RHSA-2026:27197
- https://access.redhat.com/errata/RHSA-2026:36331
- https://access.redhat.com/errata/RHSA-2026:36364
- https://access.redhat.com/errata/RHSA-2026:36618
- https://access.redhat.com/errata/RHSA-2026:36639
- https://access.redhat.com/errata/RHSA-2026:38847
- https://access.redhat.com/errata/RHSA-2026:44481
- https://access.redhat.com/errata/RHSA-2026:46836
- https://access.redhat.com/errata/RHSA-2026:58981
- https://access.redhat.com/security/cve/CVE-2026-42055
- https://bugzilla.redhat.com/show_bug.cgi?id=2489866
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42055.json
JSON original (NVD)
Mostrar
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