CVE-2026-26965

Estado: ModificadaAlta (8.8)—

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, in the RLE planar decode path, `planar_decompress_plane_rle()` writes into `pDstData` at `((nYDst+y) * nDstStep) + (4*nXDst) + nChannel` without verifying that `(nYDst+nSrcHeight)` fits in the destination height or that `(nXDst+nSrcWidth)` fits in the destination stride. When `TempFormat != DstFormat`, `pDstData` becomes `planar->pTempData` (sized for the desktop), while `nYDst` is only validated against the **surface** by `is_within_surface()`.

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A malicious RDP server can exploit this to perform a heap out-of-bounds write with attacker-controlled offset and pixel data on any connecting FreeRDP client. The OOB write reaches up to 132,096 bytes past the temp buffer end, and on the brk heap (desktop ≤ 128×128), an adjacent `NSC_CONTEXT` struct's `decode` function pointer is overwritten with attacker-controlled pixel data — control-flow–relevant corruption (function pointer overwritten) demonstrated under deterministic heap layout (`nsc->decode = 0xFF414141FF414141`). Version 3.23.0 fixes the vulnerability.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.61%
Percentil entre todas las CVEs puntuadas: 48
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.

ExplotaciónT1203 Exploitation for Client Executionexecution95 %
Impacto principalT1059 Command and Scripting Interpreterexecution90 %
Impacto secundarioT1068 Exploitation for Privilege Escalationprivilege escalation75 %

UI:R indica interacción del usuario (conexión RDP); CWE-787 (buffer overflow) permite ejecución de código por corrupción de puntero de función; la cadena de control-flow (overwrite decode function pointer) sugiere escalada a root/SYSTEM.

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

Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software Threat Intelligence Program Restrict Web-Based Content

Tecnologías afectadas (1)

Freerdp — Freerdp

CWE

CWE-787
CWE-787

Referencias

JSON original (NVD)

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  "published": "2026-02-25T21:16:43.047",
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      "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, in the RLE planar decode path, `planar_decompress_plane_rle()` writes into `pDstData` at `((nYDst+y) * nDstStep) + (4*nXDst) + nChannel` without verifying that `(nYDst+nSrcHeight)` fits in the destination height or that `(nXDst+nSrcWidth)` fits in the destination stride. When `TempFormat != DstFormat`, `pDstData` becomes `planar->pTempData` (sized for the desktop), while `nYDst` is only validated against the **surface** by `is_within_surface()`. A malicious RDP server can exploit this to perform a heap out-of-bounds write with attacker-controlled offset and pixel data on any connecting FreeRDP client. The OOB write reaches up to 132,096 bytes past the temp buffer end, and  on the brk heap (desktop ≤ 128×128), an adjacent `NSC_CONTEXT` struct's `decode` function pointer is overwritten with attacker-controlled pixel data — control-flow–relevant corruption (function pointer overwritten) demonstrated under deterministic heap layout (`nsc->decode = 0xFF414141FF414141`). Version 3.23.0 fixes the vulnerability."
    },
    {
      "lang": "es",
      "value": "FreeRDP es una implementación gratuita del Protocolo de Escritorio Remoto. Antes de la versión 3.23.0, en la ruta de decodificación planar RLE, planar_decompress_plane_rle() escribe en pDstData en ((nYDst+y) * nDstStep) + (4*nXDst) + nChannel sin verificar que (nYDst+nSrcHeight) encaje en la altura de destino o que (nXDst+nSrcWidth) encaje en el paso de destino. Cuando TempFormat != DstFormat, pDstData se convierte en planar-&gt;pTempData (dimensionado para el escritorio), mientras que nYDst solo se valida contra la superficie mediante is_within_surface(). Un servidor RDP malicioso puede explotar esto para realizar una escritura fuera de límites en el heap con un desplazamiento y datos de píxeles controlados por el atacante en cualquier cliente FreeRDP que se conecte. La escritura OOB alcanza hasta 132.096 bytes más allá del final del búfer temporal, y en el heap brk (escritorio ? 128×128), el puntero de función decode de una estructura NSC_CONTEXT adyacente se sobrescribe con datos de píxeles controlados por el atacante — corrupción relevante para el flujo de control (puntero de función sobrescrito) demostrada bajo un diseño de heap determinista (nsc-&gt;decode = 0xFF414141FF414141). La versión 3.23.0 corrige la vulnerabilidad."
    }
  ],
  "lastModified": "2026-07-15T02:19:02.680",
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