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CVE-2026-59200

Python Pillow denial of service

7.5 HIGHPublic exploitEPSS 0.39%
  1. Published14 Jul 2026

Description

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.

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≥ 5.1.0 < 12.3.0

Remediation

Fixed in
Python Pillow≥ 12.3.0

References

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Frequently asked

Is CVE-2026-59200 being actively exploited?

CVE-2026-59200 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.39%.

How severe is CVE-2026-59200?

CVE-2026-59200 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.39% probability of exploitation.

Which products are affected by CVE-2026-59200?

Affected products include Python Pillow.

How do I fix CVE-2026-59200?

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.