PT-2026-58106 · Python Pillow · Pillow

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-59200

NVD

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. This issue is fixed in version 12.3.0.

Exploit

Fix

Resource Exhaustion

Allocation of Resources Without Limits

Weakness Enumeration

CWE-400

CWE-770

Related Identifiers

CVE-2026-59200

Affected Products

Pillow

References · 5

• 🔥 https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-59200 · Security Note
• https://github.com/python-pillow/Pillow/pull/9718 · Note
• https://github.com/python-pillow/Pillow/releases/tag/12.3.0 · Note
• https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09 · Note