FKIE_CVE-2026-31806

Vulnerability from fkie_nvd - Published: 2026-03-13 19:54 - Updated: 2026-06-30 03:18
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2bPatch
security-advisories@github.comhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2Exploit, Patch, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:10076
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:10734
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:10735
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:10951
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:11323
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19033
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:6340
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:6727
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:6743
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:6799
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:6918
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:6958
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:9640
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:9641
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-31806
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2447376
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31806.json
Impacted products
Vendor Product Version
freerdp freerdp *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "FreeRDP",
          "vendor": "FreeRDP",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.24.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
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        {
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            "cpe:/o:redhat:rhel_els:7"
          ],
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          "vendor": "Red Hat"
        },
        {
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          "defaultStatus": "affected",
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          "vendor": "Red Hat"
        },
        {
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          "vendor": "Red Hat"
        },
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        },
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          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          "defaultStatus": "affected",
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          "vendor": "Red Hat"
        },
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        {
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            "cpe:/o:redhat:enterprise_linux:10.2"
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          "product": "Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)",
          "vendor": "Red Hat"
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        {
          "cpes": [
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          "product": "Red Hat Enterprise Linux CRB (v. 8)",
          "vendor": "Red Hat"
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        {
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          "vendor": "Red Hat"
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          "vendor": "Red Hat"
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          ],
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          "product": "Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "unaffected",
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      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "97FCA262-35C3-4B6B-A321-15CE780FCA20",
              "versionEndExcluding": "3.24.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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 implementaci\u00f3n gratuita del Protocolo de Escritorio Remoto. Antes de la versi\u00f3n 3.24.0, la funci\u00f3n 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 tama\u00f1o de superficie esperado. Debido a que estos valores se utilizan durante la decodificaci\u00f3n de mapas de bits y las operaciones de memoria sin una verificaci\u00f3n de l\u00edmites adecuada, esto puede conducir a un desbordamiento de b\u00fafer de pila. Dado que el atacante tambi\u00e9n puede controlar los datos de p\u00edxeles asociados transmitidos por el servidor, el desbordamiento puede ser explotable para sobrescribir memoria de pila adyacente. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 3.24.0."
    }
  ],
  "id": "CVE-2026-31806",
  "lastModified": "2026-06-30T03:18:27.163",
  "metrics": {
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          "confidentialityImpact": "HIGH",
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          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
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          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
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            {
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          "role": "CISA Coordinator",
          "timestamp": "2026-03-14T03:55:34.087938Z",
          "version": "2.0.3"
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  "published": "2026-03-13T19:54:36.300",
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    },
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    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
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          "lang": "en",
          "value": "CWE-122"
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      "source": "security-advisories@github.com",
      "type": "Primary"
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      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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