FKIE_CVE-2026-56003

Vulnerability from fkie_nvd - Published: 2026-07-08 10:16 - Updated: 2026-07-08 13:16
Severity
8.5 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.
References
meissner@suse.dehttps://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939
meissner@suse.dehttps://www.openwall.com/lists/oss-security/2026/07/08/1
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageName": "libXfont2",
          "product": "libXfont2",
          "repo": "https://gitlab.freedesktop.org/xorg/lib/libxfont/",
          "vendor": "X.Org",
          "versions": [
            {
              "lessThan": "2.0.8",
              "status": "affected",
              "version": "0",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "source": "meissner@suse.de"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server."
    }
  ],
  "id": "CVE-2026-56003",
  "lastModified": "2026-07-08T13:16:54.400",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 6.0,
        "source": "meissner@suse.de",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-56003",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-08T12:06:32.424595Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-08T10:16:23.577",
  "references": [
    {
      "source": "meissner@suse.de",
      "url": "https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939"
    },
    {
      "source": "meissner@suse.de",
      "url": "https://www.openwall.com/lists/oss-security/2026/07/08/1"
    }
  ],
  "sourceIdentifier": "meissner@suse.de",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ],
      "source": "meissner@suse.de",
      "type": "Secondary"
    }
  ]
}


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