CVE-2026-112396: medium-severity vulnerability in python-pillow Pillow
Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.9epss 0.7%
from disclosure to weapon10 days
Published on NVDOct 19
1st PoC+10d
Pillow is a Python imaging library. From 11.3.0 until 13.0.0, Pillow has a heap use-after-free when libtiff rejects a tag while encoding TIFF data to an in-memory buffer. When an application saves attacker-influenced TIFF tags to BytesIO, libtiff can reject a tag during encoding in ImagingLibTiffEncode; the error path then frees the output buffer without closing or clearing the TIFF handle, and later cleanup flushes through the write callback into freed memory, which can crash the process and may enable code execution. This issue is fixed in version 13.0.0.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
python-pillow · Pillowpublic PoCs found — 1
githubgithub.com/8hw3/pillow-uaf-research★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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