| Package | Affected versions | Patched versions |
|---|---|---|
| php | = 8.5.0≥ 8.1.0, < 8.1.34≥ 8.2.0, < 8.2.30≥ 8.3.0, < 8.3.29≥ 8.4.0, < 8.4.16 | 8.1.348.2.308.3.298.4.16 |
In PHP versions:8.1.* before 8.1.34, 8.2.* before 8.2.30, 8.3.* before 8.3.29, 8.4.* before 8.4.16, 8.5.* before 8.5.1, the getimagesize() function may leak uninitialized heap memory into the APPn segments (e.g., APP1) when reading images in multi-chunk mode (such as via php://filter). This occurs due to a bug in php_read_stream_all_chunks() that overwrites the buffer without advancing the pointer, leaving tail bytes uninitialized. This may lead to information disclosure of sensitive heap data and affect the confidentiality of the target server.
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