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CVE-2026-55379

Pillow BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb protection bypass via font loading

Published: Jul 6, 2026Updated: Jul 7, 2026 Sources: CVE List NVDCWE-789
7.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 65.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing excessive memory allocation. This issue is fixed in version 12.3.0.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-789

Affected Products

python
oss-project·US
pillow
OSS Libraries
python-pillow
oss-projectaka pillow
PillowLibrary
OSS Libraries / pypi

Exploitability

Official Patch Available
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References

https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst
github.com
https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d
github.com
https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc
github.com

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