Input validation error in PHP - CVE-2009-1271
Published: October 3, 2018 / Updated: June 8, 2025
Vulnerability identifier: #VU110327
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2009-1271
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
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.
Affected software
PHP
How to mitigate CVE-2009-1271
Install update from vendor's website.
PHP - update to 5.2.9
External References
- http://cvs.php.net/viewvc.cgi/php-src/ext/json/JSON_parser.c?r1=1.1.2.14&r2=1.1.2.15
- http://lists.apple.com/archives/security-announce/2009/Sep/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
- http://secunia.com/advisories/34770
- http://secunia.com/advisories/34830
- http://secunia.com/advisories/34933
- http://secunia.com/advisories/35003
- http://secunia.com/advisories/35007
- http://secunia.com/advisories/35306
- http://secunia.com/advisories/35685
- http://secunia.com/advisories/36701
- http://support.apple.com/kb/HT3865
- http://www.debian.org/security/2009/dsa-1775
- http://www.debian.org/security/2009/dsa-1789
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:090
- http://www.openwall.com/lists/oss-security/2009/04/01/9
- http://www.php.net/releases/5_2_9.php
- http://www.redhat.com/support/errata/RHSA-2009-0350.html
- http://www.ubuntu.com/usn/USN-761-2
- https://usn.ubuntu.com/761-1/
- https://www.redhat.com/archives/fedora-package-announce/2009-May/msg01451.html
- https://www.redhat.com/archives/fedora-package-announce/2009-May/msg01465.html