FKIE_CVE-2026-33984

Vulnerability from fkie_nvd - Published: 2026-03-30 22:16 - Updated: 2026-06-30 03:18
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:H/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 version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.
References
security-advisories@github.comhttps://github.com/FreeRDP/FreeRDP/commit/dc7fdb165095139be779a4000199bc1706b06ad5Patch
security-advisories@github.comhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6Patch, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:10709
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:11332
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:11333
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:11336
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:11649
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:11651
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:12359
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:12388
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19033
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19349
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:8457
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:8458
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:8945
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:9656
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-33984
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2453219
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33984.json
Impacted products
Vendor Product Version
freerdp freerdp *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "FreeRDP",
          "vendor": "FreeRDP",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.24.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
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          "product": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)",
          "vendor": "Red Hat"
        },
        {
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            "cpe:/o:redhat:enterprise_linux:10.2"
          ],
          "defaultStatus": "affected",
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          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream (v. 8)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.2::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream AUS (v. 8.2)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:rhel_aus:8.4::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream AUS (v.8.4)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)",
          "vendor": "Red Hat"
        },
        {
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          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream AUS (v.8.6)",
          "vendor": "Red Hat"
        },
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          "product": "Red Hat Enterprise Linux AppStream E4S (v.8.6)",
          "vendor": "Red Hat"
        },
        {
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          "vendor": "Red Hat"
        },
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          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream E4S (v.8.8)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream TUS (v.8.8)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream E4S (v.9.0)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream E4S (v.9.2)",
          "vendor": "Red Hat"
        },
        {
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          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream EUS (v.9.4)",
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        },
        {
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          "vendor": "Red Hat"
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  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "03FF152C-C651-4586-8958-1555D9797516",
              "versionEndExcluding": "3.24.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry-\u003esize is updated to vBarEntry-\u003ecount before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count \u003c= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2."
    },
    {
      "lang": "es",
      "value": "FreeRDP es una implementaci\u00f3n gratuita del Protocolo de Escritorio Remoto. Antes de la versi\u00f3n 3.24.2, en resize_vbar_entry() en libfreerdp/codec/clear.c, vBarEntry-\u0026gt;size se actualiza a vBarEntry-\u0026gt;count antes de la llamada a winpr_aligned_recalloc(). Si realloc falla, size se infla mientras pixels a\u00fan apunta al b\u00fafer antiguo y m\u00e1s peque\u00f1o. En una llamada posterior donde count \u0026lt;= size (el valor inflado), realloc se omite. El llamador luego escribe count * bpp bytes de datos de p\u00edxeles controlados por el atacante en el b\u00fafer de tama\u00f1o insuficiente, causando un desbordamiento de b\u00fafer de pila. Este problema ha sido parcheado en la versi\u00f3n 3.24.2."
    }
  ],
  "id": "CVE-2026-33984",
  "lastModified": "2026-06-30T03:18:48.577",
  "metrics": {
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      {
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
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        "type": "Secondary"
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          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
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          "options": [
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            {
              "technicalImpact": "total"
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          "role": "CISA Coordinator",
          "timestamp": "2026-04-02T03:55:56.355506Z",
          "version": "2.0.3"
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  "published": "2026-03-30T22:16:19.567",
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-122"
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  ]
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.