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CVE-2006-7226

Status: ModifiedMedium (4.3)—

Perl-Compatible Regular Expression (PCRE) library before 6.7 does not properly calculate the compiled memory allocation for regular expressions that involve a quantified "subpattern containing a named recursion or subroutine reference," which allows context-dependent attackers to cause a denial of service (error or crash).

CVSS

Exploitation probability (EPSS)

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 (2)

Redhat — Enterprise LinuxRedhat — Enterprise Linux Desktop

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2006-7226",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2007-12-03T20:46:00.000",
  "references": [
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2008-01/msg00006.html",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://secunia.com/advisories/28041",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://secunia.com/advisories/28658",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://support.avaya.com/elmodocs2/security/ASA-2007-505.htm",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.mandriva.com/security/advisories?name=MDVSA-2008:030",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.pcre.org/changelog.txt",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.redhat.com/support/errata/RHSA-2007-1059.html",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.redhat.com/support/errata/RHSA-2007-1068.html",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/26727",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=384781",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/40020",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11545",
      "source": "secalert@redhat.com"
    },
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2008-01/msg00006.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://secunia.com/advisories/28041",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://secunia.com/advisories/28658",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://support.avaya.com/elmodocs2/security/ASA-2007-505.htm",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.mandriva.com/security/advisories?name=MDVSA-2008:030",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.pcre.org/changelog.txt",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.redhat.com/support/errata/RHSA-2007-1059.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.redhat.com/support/errata/RHSA-2007-1068.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/26727",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=384781",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/40020",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11545",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Perl-Compatible Regular Expression (PCRE) library before 6.7 does not properly calculate the compiled memory allocation for regular expressions that involve a quantified \"subpattern containing a named recursion or subroutine reference,\" which allows context-dependent attackers to cause a denial of service (error or crash)."
    },
    {
      "lang": "es",
      "value": "La biblioteca Perl-Compatible Regular Expression (PCRE) versiones anteriores a 6.7 no calcula apropiadamente la ubicación de memoria compilada para expresiones regulares que involucran un \"subpatrón conteniendo un recursión nombrada ó referencia a subrutina\" cuantificado, lo cual permite a atacantes locales o remotos dependientes del contexto provocar una denegación de servicio (error o caída)"
    }
  ],
  "lastModified": "2026-06-16T22:34:36.860",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:redhat:enterprise_linux_desktop:4.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7D74A418-50F0-42C0-ABBC-BBBE718FF025"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "matchCriteriaId": "49EF5B77-9BC9-4AE8-A677-48E5E576BE63"
            },
            {
              "criteria": "cpe:2.3:o:redhat:enterprise_linux:4.0:*:es:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "36389D32-61C1-4487-8399-FA7D2864FACD"
            },
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              "vulnerable": true,
              "matchCriteriaId": "49B67F74-AF8F-4A27-AA8A-A8479E256A9F"
            }
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          "operator": "OR"
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  "sourceIdentifier": "secalert@redhat.com"
}