CVE-2009-4418
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a...
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences.
Exploit likelihood
What each source reports
NVD Score used
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences.
- Record
CVE-2009-4418- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-189
- Updated
- 2026-11-02
CVE List No score
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences.
- Record
CVE-2009-4418- Updated
- 2026-11-02
EUVDEUVD-2009-4385 No score
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences.
- Record
EUVD-2009-4385- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-37px-x6g4-3pm2 No score
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a...
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences.
- Record
GHSA-37px-x6g4-3pm2- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-4418 is a medium vulnerability (CVSS 5.0) in Php, published December 24, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.97%, the 62nd percentile. No source names a fixed version.