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.
2009-12-24T17:30:00.233
2025-04-09T00:30:58.490
Deferred
CVSSv2: 5.0 (MEDIUM)
AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | php | php | ≤ 5.3.0 | Yes |
| Application | php | php | 5 | Yes |
| Application | php | php | 5.0 | Yes |
| Application | php | php | 5.0 | Yes |
| Application | php | php | 5.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.0 | Yes |
| Application | php | php | 5.0.1 | Yes |
| Application | php | php | 5.0.2 | Yes |
| Application | php | php | 5.0.3 | Yes |
| Application | php | php | 5.0.4 | Yes |
| Application | php | php | 5.0.5 | Yes |
| Application | php | php | 5.1.0 | Yes |
| Application | php | php | 5.1.1 | Yes |
| Application | php | php | 5.1.2 | Yes |
| Application | php | php | 5.1.3 | Yes |
| Application | php | php | 5.1.4 | Yes |
| Application | php | php | 5.1.5 | Yes |
| Application | php | php | 5.1.6 | Yes |
| Application | php | php | 5.2.0 | Yes |
| Application | php | php | 5.2.1 | Yes |
| Application | php | php | 5.2.2 | Yes |
| Application | php | php | 5.2.3 | Yes |
| Application | php | php | 5.2.4 | Yes |
| Application | php | php | 5.2.4 | Yes |
| Application | php | php | 5.2.5 | Yes |
| Application | php | php | 5.2.6 | Yes |
| Application | php | php | 5.2.7 | Yes |
| Application | php | php | 5.2.8 | Yes |
| Application | php | php | 5.2.9 | Yes |
| Application | php | php | 5.2.10 | Yes |
| Application | php | php | 5.2.11 | Yes |