CVE-2005-2491

Status: ModifiedHigh (7.5)—
Integer overflow in pcre_compile.c in Perl Compatible Regular Expressions (PCRE) before 6.2, as used in multiple products such as Python, Ethereal, and PHP, allows attackers to execute arbitrary code via quantifier values in regular expressions, which leads to a heap-based buffer overflow.
CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Base score: 7.5
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 4.34%
Percentile among all scored CVEs: 91
Score date: 10/7/2026
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).
Affected technologies (1)

Pcre — Pcre
CWEs

NVD-CWE-Other
References

Raw JSON (NVD)

Show
{
  "id": "CVE-2005-2491",
  "cveTags": [],
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          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": true,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11516",
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    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1496",
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Integer overflow in pcre_compile.c in Perl Compatible Regular Expressions (PCRE) before 6.2, as used in multiple products such as Python, Ethereal, and PHP, allows attackers to execute arbitrary code via quantifier values in regular expressions, which leads to a heap-based buffer overflow."
    }
  ],
  "lastModified": "2026-06-16T22:14:59.680",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:pcre:pcre:5.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0E71EAB3-BEFE-4442-A18A-F2739DE3B0BA"
            },
            {
              "criteria": "cpe:2.3:a:pcre:pcre:6.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F23E7A02-29EF-41CE-9E05-9224F832BAC6"
            },
            {
              "criteria": "cpe:2.3:a:pcre:pcre:6.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3EC32309-4E60-4A56-808E-5494B1CD3D2F"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "vendorComments": [
    {
      "comment": "Fixed in Apache 2.0.55:\nhttp://httpd.apache.org/security/vulnerabilities_20.html",
      "lastModified": "2008-07-02T00:00:00",
      "organization": "Apache"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com"
}