CVE-2026-41316
Estado: AplazadaAlta (8.1)—
ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an `@_init` instance variable guard in `ERB#result` and `ERB#run` to prevent code execution when an ERB object is reconstructed via `Marshal.load` (deserialization). However, three other public methods that also evaluate `@src` via `eval()` were not given the same guard: `ERB#def_method`, `ERB#def_module`, and `ERB#def_class`. An attacker who can trigger `Marshal.load` on untrusted data in a Ruby application that has `erb` loaded can use `ERB#def_module` (zero-arg, default parameters) as a code execution sink, bypassing the `@_init` protection entirely. ERB 4.0.3.1, 4.0.4.1, 6.0.1.1, and 6.0.4 patch the issue.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 8.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.31%
- Percentil entre todas las CVEs puntuadas: 70
- 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 access75 % - Impacto principal
T1059Command and Scripting Interpreterexecution85 % - Impacto secundario
T1068Exploitation for Privilege Escalationprivilege escalation65 %
Vulnerabilidad en deserialization (Marshal.load) de ERB con AV:N permite ejecución remota de código mediante eval() en métodos públicos; bypass de controles de seguridad en aplicación Ruby expuesta.
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 (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-693
- CWE-502
Referencias
- https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv
- https://access.redhat.com/errata/RHSA-2026:18030
- https://access.redhat.com/errata/RHSA-2026:18039
- https://access.redhat.com/errata/RHSA-2026:18065
- https://access.redhat.com/errata/RHSA-2026:20596
- https://access.redhat.com/errata/RHSA-2026:20606
- https://access.redhat.com/errata/RHSA-2026:20614
- https://access.redhat.com/errata/RHSA-2026:20670
- https://access.redhat.com/errata/RHSA-2026:26312
- https://access.redhat.com/errata/RHSA-2026:26655
- https://access.redhat.com/errata/RHSA-2026:33462
- https://access.redhat.com/errata/RHSA-2026:33478
- https://access.redhat.com/errata/RHSA-2026:35834
- https://access.redhat.com/errata/RHSA-2026:37238
- https://access.redhat.com/security/cve/CVE-2026-41316
- https://bugzilla.redhat.com/show_bug.cgi?id=2461369
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41316.json
JSON original (NVD)
Mostrar
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}
],
"lastModified": "2026-08-24T13:18:33.597",
"sourceIdentifier": "security-advisories@github.com"
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