High severity · published Jul 6, 2026
CVE-2026-55380
Pillow GdImageFile decompression bomb protection bypass
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PI
Pillow · python-pillow
< 12.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55380
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55380
Release Notes
https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst
Patch
https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675
Exploit
https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm
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