Vulnerability-Lookup

CVE-2026-44420 (GCVE-0-2026-44420)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:42 – Updated: 2026-06-02 03:55

Title

FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/yhirose/cpp-httplib/security/a…	exploit

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44420

Vulnerability from fkie_nvd - Published: 2026-05-29 20:16 - Updated: 2026-06-02 03:16

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r	Exploit, Mitigation, Vendor Advisory
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8

Impacted products

	Vendor	Product	Version
	freerdp	freerdp	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "186FAA8A-CF9D-40F3-8509-DAC168BFDA2F",
              "versionEndExcluding": "3.26.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP\u0027s server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0."
    }
  ],
  "id": "CVE-2026-44420",
  "lastModified": "2026-06-02T03:16:17.143",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
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        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
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      "type": "Secondary"
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}

WID-SEC-W-2026-1470

Vulnerability from csaf_certbund - Published: 2026-05-11 22:00 - Updated: 2026-05-26 22:00

Summary

FreeRDP: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: FreeRDP ist eine freie Implementierung des Remote Desktop Protocol (RDP).

Angriff: Ein Angreifer kann mehrere Schwachstellen in FreeRDP ausnutzen, um beliebigen Programmcode auszuführen, einen Denial-of-Service-Zustand zu verursachen oder nicht näher spezifizierte Angriffe durchzuführen.

Betroffene Betriebssysteme: - Sonstiges - UNIX - Windows

CVE-2026-44420

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source FreeRDP <3.26.0 Open Source / FreeRDP		<3.26.0

Vulnerability 2

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source FreeRDP <3.26.0 Open Source / FreeRDP		<3.26.0

CVE-2026-40033

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source FreeRDP <3.26.0 Open Source / FreeRDP		<3.26.0

Vulnerability 4

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source FreeRDP <3.26.0 Open Source / FreeRDP		<3.26.0

References

6 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/FreeRDP/FreeRDP/security/advis…	external
https://github.com/FreeRDP/FreeRDP/security/advis…	external
https://github.com/FreeRDP/FreeRDP/security/advis…	external
https://github.com/FreeRDP/FreeRDP/security/advis…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "FreeRDP ist eine freie Implementierung des Remote Desktop Protocol (RDP).",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in FreeRDP ausnutzen, um beliebigen Programmcode auszuf\u00fchren, einen Denial-of-Service-Zustand zu verursachen oder nicht n\u00e4her spezifizierte Angriffe durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1470 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1470.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1470 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1470"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-j9q5-7g8m-jc9v vom 2026-05-11",
        "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j9q5-7g8m-jc9v"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-mpxh-8fq3-x8mh vom 2026-05-11",
        "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mpxh-8fq3-x8mh"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-mvpx-xj7r-3p3r vom 2026-05-11",
        "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-p6r2-4hgm-m6ff vom 2026-05-11",
        "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff"
      }
    ],
    "source_lang": "en-US",
    "title": "FreeRDP: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-05-26T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-27T06:45:38.297+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1470",
      "initial_release_date": "2026-05-11T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-11T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-05-26T22:00:00.000+00:00",
          "number": "2",
          "summary": "CVE-2026-40033 erg\u00e4nzt"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c3.26.0",
                "product": {
                  "name": "Open Source FreeRDP \u003c3.26.0",
                  "product_id": "T053826"
                }
              },
              {
                "category": "product_version",
                "name": "3.26.0",
                "product": {
                  "name": "Open Source FreeRDP 3.26.0",
                  "product_id": "T053826-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:freerdp:freerdp:3.26.0"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "FreeRDP"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-44420",
      "product_status": {
        "known_affected": [
          "T053826"
        ]
      },
      "release_date": "2026-05-11T22:00:00.000+00:00",
      "title": "CVE-2026-44420"
    },
    {
      "product_status": {
        "known_affected": [
          "T053826"
        ]
      },
      "release_date": "2026-05-11T22:00:00.000+00:00"
    },
    {
      "cve": "CVE-2026-40033",
      "product_status": {
        "known_affected": [
          "T053826"
        ]
      },
      "release_date": "2026-05-11T22:00:00.000+00:00",
      "title": "CVE-2026-40033"
    },
    {
      "product_status": {
        "known_affected": [
          "T053826"
        ]
      },
      "release_date": "2026-05-11T22:00:00.000+00:00"
    }
  ]
}

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.

Action not permitted

CVE-2026-44420 (GCVE-0-2026-44420)

FKIE_CVE-2026-44420

WID-SEC-W-2026-1470

Tags

Sightings

Nomenclature