CVE-2010-0050

Status: ModifiedHigh (8.8)—💥 Exploit
Use-after-free vulnerability in WebKit in Apple Safari before 4.0.5 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via an HTML document with improperly nested tags.
CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base score: 8.8
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 12%
Percentile among all scored CVEs: 96
Score date: 10/9/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.
Published on Exploit-DB · Webkit (Apple Safari 4.0.5) - Blink Tag Stack Exhaustion Denial of Service (4/27/2010)
Affected technologies (5)

Apple — Iphone OS Apple — Safari Canonical — Ubuntu Linux Fedoraproject — Fedora Opensuse — Opensuse
CWEs

CWE-416
References

Raw JSON (NVD)

Show
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  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
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  "descriptions": [
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      "lang": "en",
      "value": "Use-after-free vulnerability in WebKit in Apple Safari before 4.0.5 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via an HTML document with improperly nested tags."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad uso después de la liberación (use-after-free) en Apple Safari anterior v4.0.5 permite a atacantes remotos ejecutar código de su elección o causar una denegación de servicio (caída de aplicación) a través de un documento HTML con etiquetas inadecuadamente anidadas."
    }
  ],
  "lastModified": "2026-06-16T23:15:19.107",
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  "evaluatorComment": "Per: http://lists.apple.com/archives/security-announce/2010/Mar/msg00000.html\n\n\n'WebKit\nCVE-ID:  CVE-2010-0050\nAvailable for:  Mac OS X v10.4.11, Mac OS X Server v10.4.11,\nMac OS X v10.5.8, Mac OS X Server v10.5.8,\nMac OS X v10.6.1 or later, Mac OS X Server v10.6.1 or later,\nWindows 7, Vista, XP\nImpact:  Visiting a maliciously crafted website may lead to an\nunexpected application termination or arbitrary code execution\nDescription:  A use-after-free issue exists in WebKit's handling of\nincorrectly nested HTML tags. Visiting a maliciously crafted website\nmay lead to an unexpected application termination or arbitrary code\nexecution. This issue is addressed through improved memory reference\ntracking. Credit to wushi&amp;Z of team509 working with TippingPoint's\nZero Day Initiative for reporting this issue.'",
  "sourceIdentifier": "product-security@apple.com",
  "evaluatorSolution": "Per: http://lists.apple.com/archives/security-announce/2010/Mar/msg00000.html\n\n'Safari 4.0.5 is available via the Apple Software Update application,\nor Apple's Safari download site at:\nhttp://www.apple.com/safari/download/'"
}