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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| pillow | pip | < 2.3.2 | 2.3.2 |
| pillow | pip | >= 2.5, < 2.5.2 | 2.5.2 |
The vulnerability stems from missing input validation in the ICNS image parser. The GitHub patch adds a critical check for 'blocksize <= 0' in IcnsImagePlugin.py's init method, which directly addresses CVE-2014-3589. The unpatched code allowed malicious block sizes to trigger denial of service via invalid memory operations. The function's role in parsing ICNS headers and the explicit fix in this method confirm its vulnerability.
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