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Servers and applications

CVE-2009-1271

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.

Severity
Medium 5.0
Published
8 Apr 2009
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
2.4% in the next 30 daysHigher than 84% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • Version 5.2.8
  • Version 5.2.7
  • Version 5.2.6
  • Version 5.2.5
All 9 release lines
  • Version 5.2.0
  • Version 5.2.1
  • Version 5.2.2
  • Version 5.2.3
  • Version 5.2.4
  • Version 5.2.5
  • Version 5.2.6
  • Version 5.2.7
  • Version 5.2.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2009-1271
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2009-1271