CVE-2026-55380

Pillow GdImageFile decompression bomb protection bypass

Published Jul 6, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-phj9-mv4w-65pm Pillow `GdImageFile._open()`: image dimensions accepted without `_decompression_bomb_check()`
Ubuntu USN Ubuntu USN USN-8999-1 Pillow vulnerabilities
History
Type Values Removed Values Added
First Time appeared Python-pillow
Python-pillow pillow
Vendors & Products Python-pillow
Python-pillow pillow
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.
Title Pillow GdImageFile decompression bomb protection bypass
Weaknesses CWE-789
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 6, 2026, 7:23 PM
Reserved
Jun 16, 2026, 6:57 PM
Status
Analyzed
Published
Jul 6, 2026, 7:17 PM
Modified
Oct 25, 2026, 8:10 PM
Severity
Important
Public date
Jul 6, 2026, 6:50 PM