CVE-2026-112396Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 20, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
python-pillow Pillow python_pillow:pillow (from the name) | from 11.3.0, < 13.0.0 | CNA record |
References
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rr5-89j8-mwwmx-refsource-confirm
- https://github.com/python-pillow/Pillow/commit/dc95da20207827a062cfbf551ee9f6031465a8bbx-refsource-misc
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.