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Fencer Vulns
medium 5.0

CVE-2009-1271 json

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 (segmentat…

published 2009-04-08 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1270

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

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.

Patch / fix

  • php RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2
  • php-gd RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2
  • php-cli RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2
  • php-dba RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2
  • php-pdo RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2
  • php-xml RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2
  • php-imap RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2
  • php-ldap RHEL 2 APPLICATION_STACK 5.2.6-4.el5s2

red hat advisories RHSA-2009:0350

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-1271 updated cvss 4.3

php: crash on malformed input in json_decode()

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.40% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.