pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash).
No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/bigcat88/pillow_heif/commit/8305a15d3780c533b762578cbe987d27…
security-advisories@github.com
https://github.com/bigcat88/pillow_heif/releases/tag/v1.3.0
security-advisories@github.com
https://github.com/bigcat88/pillow_heif/security/advisories/GHSA-5gjj-6r7v-ph3x
security-advisories@github.com