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 (segmentati
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.
- Published
- Apr 8, 2009
- Updated
- Jun 16, 2026
- EPSS
- 2.4% · 83th percentile
- CWE
- —
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 20 / 40 · 5.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.4%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| php | php | cpe:2.3:a:php:php |
Using php? Add it to your stack and be the first to know about CVEs like this one. (PHP)
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- php php5.2.0
- php php5.2.1
- php php5.2.2
- php php5.2.3
- php php5.2.4
- php php5.2.5
- php php5.2.6
- php php5.2.7
- php php5.2.8
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:4.0 | php-json-ext | before 1.2.1-3.2+etch1 | 1.2.1-3.2+etch1 |
| Debian:4.0 | php5 | before 5.2.0+dfsg-8+etch15 | 5.2.0+dfsg-8+etch15 |
| Debian:5.0 | php5 | before 5.2.6.dfsg.1-1+lenny3 | 5.2.6.dfsg.1-1+lenny3 |
| Red Hat:rhel_application_stack:2 | php | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-bcmath | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-cli | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-common | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-dba | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-debuginfo | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-devel | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-gd | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-imap | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-ldap | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-mbstring | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-mysql | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-ncurses | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-odbc | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-pdo | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-pgsql | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-snmp | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-soap | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-xml | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
| Red Hat:rhel_application_stack:2 | php-xmlrpc | before 0:5.2.6-4.el5s2 | 0:5.2.6-4.el5s2 |
Same product
php: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-4577Argument Injection in PHP-CGIKEV99Now
- CVE-2019-11043Underflow in PHP-FPM can lead to RCEKEV99Now
- CVE-2012-1823sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script (aka php-cgi), does not properly handle queKEV99Now
- CVE-2018-7584In PHP through 5.6.33, 7.0.x before 7.0.28, 7.1.x through 7.1.14, and 7.2.x through 7.2.2, there is a stack-based buffer under-read while pa65This week
- CVE-2018-19518University of Washington IMAP Toolkit 2007f on UNIX, as used in imap_open() in PHP and other products, launches an rsh command (by means of 59Plan
- CVE-2016-3078Multiple integer overflows in php_zip.c in the zip extension in PHP before 7.0.6 allow remote attackers to cause a denial of service (heap-b56Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:php-json-ext | 1.2.1-3.2+etch1 · Debian:4.0 | Package registry (OSV) |
| debian:php5 | 5.2.0+dfsg-8+etch15 · Debian:4.0 | Package registry (OSV) |
| red hat:php | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-bcmath | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-cli | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-common | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-dba | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-debuginfo | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-devel | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-gd | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-imap | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-ldap | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-mbstring | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
| red hat:php-mysql | 0:5.2.6-4.el5s2 · Red Hat:rhel_application_stack:2 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
—
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- cvs.php.net/viewvc.cgi/php-src/ext/json/JSON_parser.c?r1=1.1.2.14&r2=1.1.2.15
- lists.apple.com/archives/security-announce/2009/Sep/msg00004.html
- lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
- secunia.com/advisories/34770
- secunia.com/advisories/34830
- secunia.com/advisories/34933
- secunia.com/advisories/35003
- secunia.com/advisories/35007
- secunia.com/advisories/35306
- secunia.com/advisories/35685
- secunia.com/advisories/36701
- support.apple.com/kb/HT3865
- www.debian.org/security/2009/dsa-1775
- www.debian.org/security/2009/dsa-1789
- www.mandriva.com/security/advisories?name=MDVSA-2009:090
- www.openwall.com/lists/oss-security/2009/04/01/9
- www.php.net/releases/5_2_9.php
- www.redhat.com/support/errata/RHSA-2009-0350.html
- www.ubuntu.com/usn/USN-761-2
- usn.ubuntu.com/761-1/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.