CVE-2026-112396

Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer

Description

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.

Scores

Faiblesses (CWE)

• CWE-416

Avis

• GHSA-4rr5-89j8-mwwm — Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer
• PYSEC-2026-4328 — 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-memo

Références européennes

• ENISA EUVD · EUVD-2026-104632
• GCVE · GCVE-0-2026-112396

Configurations affectées (CPE NVD)

• cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* ≥ 11.3.0 < 13.0.0

Produits affectés

Références

• https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rr5-89j8-mwwm
• https://github.com/python-pillow/Pillow/commit/dc95da20207827a062cfbf551ee9f6031465a8bb
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0

Sources