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CVE-2009-1271

Status: ModifiedMedium (5)—
Severity5Medium · CVSS 2.0
Exploitation probability2.40 %higher than 84% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

The JSON_parser function (ext/json/JSON_parser.c) in PHP 5.2.x before 5.2.9 allows remote attackers to cause a denial of service (segmentation fault) via a malformed string to the json_decode API function.

CVSS

Base score
5
Version
2.0
Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
2.40 %
Percentile among all scored CVEs
84
Score date
10/24/2026

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)

PHP — PHP

CWEs

References

Show 44 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2009-1271",
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  "metrics": {
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        "source": "nvd@nist.gov",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
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  "published": "2009-04-08T18:30:00.187",
  "references": [
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      "url": "http://cvs.php.net/viewvc.cgi/php-src/ext/json/JSON_parser.c?r1=1.1.2.14&r2=1.1.2.15",
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      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The JSON_parser function (ext/json/JSON_parser.c) in PHP 5.2.x before 5.2.9 allows remote attackers to cause a denial of service (segmentation fault) via a malformed string to the json_decode API function."
    },
    {
      "lang": "es",
      "value": "La función JSON_parser (ext/json/JSON_parser.c) en PHP v5.2.x anteriores a v5.2.9 permite a atacantes remotos provocar una denegación de servicio (falta de segmentación) a través de una cadena formada de forma incorrecta a la función API json_decode.\r\n"
    }
  ],
  "lastModified": "2026-06-16T23:06:54.820",
  "configurations": [
    {
      "nodes": [
        {
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            {
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          "operator": "OR"
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  "vendorComments": [
    {
      "comment": "This issue did not affect PHP versions as shipped in Red Hat Enterprise Linux 2.1, 3, 4, and 5, and Red Hat Application Stack v1. PHP version in Red Hat Application Stack v2 was fixed via: https://rhn.redhat.com/errata/RHSA-2009-0350.html",
      "lastModified": "2009-04-15T00:00:00",
      "organization": "Red Hat"
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}