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CVE-2026-55379

Python Pillow vulnerability

7.5 HIGHPublic exploitEPSS 0.42%
  1. Published6 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Python Pillow< 12.3.0

Remediation

Fixed in
Python Pillow≥ 12.3.0

References

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Frequently asked

Is CVE-2026-55379 being actively exploited?

CVE-2026-55379 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-55379?

CVE-2026-55379 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-55379?

Affected products include Python Pillow.

How do I fix CVE-2026-55379?

Upgrade affected software to a fixed version, for example Python Pillow 12.3.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.