CVE-2009-1271

The JSON_parser function (ext/json/JSON_parser.c) in PHP 5.2.x before 5.2.9 allows remote...

5.0 MediumFix available

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.

Exploit likelihood

2.40%Down 2.0 points since Feb 4, 2022

What each source reports

NVD Score used 5.0

Record: CVE-2009-1271
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated: 2026-11-02

CVE List No score

Record: CVE-2009-1271
Updated: 2026-11-02

EUVDEUVD-2009-1270 No score

Record: EUVD-2009-1270
Updated: 2026-11-03

GitHub AdvisoriesGHSA-2c9q-p5rf-5vp8 No score

The JSON_parser function (ext/json/JSON_parser.c) in PHP 5.2.x before 5.2.9 allows remote...

Record: GHSA-2c9q-p5rf-5vp8
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`php-json-ext` Debian:4.0	before 1.2.1-3.2+etch1, plus listed versions 1.2.1-3.2	1.2.1-3.2+etch1
`php5` Debian:4.0 From an advisory covering 8 CVEs	before 5.2.0+dfsg-8+etch15, plus listed versions 5.2.0-105.2.0-10+lenny15.2.0-115.2.0-8+etch15.2.0-8+etch10 Show 12 moreShow less 5.2.0-8+etch115.2.0-8+etch11~p15.2.0-8+etch135.2.0-8+etch35.2.0-8+etch45.2.0-8+etch5~pu15.2.0-8+etch65.2.0-8+etch75.2.0-8+etch85.2.0-8+etch95.2.0-8+etch9~bpo31+15.2.0-9	5.2.0+dfsg-8+etch15
`php5` Debian:5.0 From an advisory covering 8 CVEs	before 5.2.6.dfsg.1-1+lenny3, plus listed versions 5.2.6.dfsg.1-1+lenny2	5.2.6.dfsg.1-1+lenny3
`php` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-bcmath` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-cli` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-common` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-dba` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-debuginfo` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-devel` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2

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Affected packages
Package	Affected	Fixed
`php-gd` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-imap` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-ldap` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-mbstring` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-mysql` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-ncurses` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-odbc` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-pdo` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-pgsql` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-snmp` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-soap` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-xml` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2
`php-xmlrpc` Red Hat:rhel_application_stack:2 From an advisory covering 8 CVEs	before 0:5.2.6-4.el5s2	0:5.2.6-4.el5s2

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-1271 is a medium vulnerability (CVSS 5.0) in Php, published April 8, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.40%, the 84th percentile. Fixed in php-json-ext 1.2.1-3.2+etch1.

References

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