CVE-2026-31806
Estado: ModificadaCrítica (9.3)—
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size.
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Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0.
CVSS
- Versión: 4.0
- Vector: CVSS:4.0/AV:N/AC:L/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: 9.3
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.66%
- Percentil entre todas las CVEs puntuadas: 50
- 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 secundario
T1068Exploitation for Privilege Escalationprivilege escalation70 %
Servidor RDP remoto malicioso explota desbordamiento de heap en validación de dimensiones (CWE-122/131) sin autenticación previa (AV:N/PR:N); permite ejecución de código arbitrario o escalada local.
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)
CWE
- CWE-122
- CWE-131
Referencias
- https://github.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2b
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2
- https://access.redhat.com/errata/RHSA-2026:10076
- https://access.redhat.com/errata/RHSA-2026:10734
- https://access.redhat.com/errata/RHSA-2026:10735
- https://access.redhat.com/errata/RHSA-2026:10951
- https://access.redhat.com/errata/RHSA-2026:11323
- https://access.redhat.com/errata/RHSA-2026:19033
- https://access.redhat.com/errata/RHSA-2026:6340
- https://access.redhat.com/errata/RHSA-2026:6727
- https://access.redhat.com/errata/RHSA-2026:6743
- https://access.redhat.com/errata/RHSA-2026:6799
- https://access.redhat.com/errata/RHSA-2026:6918
- https://access.redhat.com/errata/RHSA-2026:6958
- https://access.redhat.com/errata/RHSA-2026:9640
- https://access.redhat.com/errata/RHSA-2026:9641
- https://access.redhat.com/security/cve/CVE-2026-31806
- https://bugzilla.redhat.com/show_bug.cgi?id=2447376
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31806.json
JSON original (NVD)
Mostrar
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"published": "2026-03-13T19:54:36.300",
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"value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0."
},
{
"lang": "es",
"value": "FreeRDP es una implementación gratuita del Protocolo de Escritorio Remoto. Antes de la versión 3.24.0, la función gdi_surface_bits() procesa los mensajes SURFACE_BITS_COMMAND enviados por el servidor RDP. Cuando el comando se maneja usando NSCodec, los valores bmp.width y bmp.height proporcionados por el servidor no se validan correctamente contra las dimensiones reales del escritorio. Un servidor RDP malicioso puede proporcionar valores bmp.width y bmp.height manipulados que exceden el tamaño de superficie esperado. Debido a que estos valores se utilizan durante la decodificación de mapas de bits y las operaciones de memoria sin una verificación de límites adecuada, esto puede conducir a un desbordamiento de búfer de pila. Dado que el atacante también puede controlar los datos de píxeles asociados transmitidos por el servidor, el desbordamiento puede ser explotable para sobrescribir memoria de pila adyacente. Esta vulnerabilidad está corregida en la versión 3.24.0."
}
],
"lastModified": "2026-07-15T02:19:50.480",
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