Medium 5.1Published May 9, 2026

CVE-2026-42310Pillow: PDF Parsing Trailer Infinite Loop (DoS)

Updated under an hour ago (Oct 27, 2026, 3:50 AM ET)

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It affects python-pillow Pillow and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for python-pillow Pillow

Exploited in the last 30 days

Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.

CVSS: 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness (CWE): CWE-835
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

python-pillow Pillow python_pillow:pillow (from the name)	from 4.2.0, < 12.2.0	CNA record
python pillow python:pillow	from 4.2.0 before 12.2.0	NVD

References

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7	x-refsource-confirm, patch, vendor-advisory
https://github.com/python-pillow/Pillow/pull/9519	x-refsource-misc, issue-tracking, patch
https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468	x-refsource-misc, patch
https://github.com/python-pillow/Pillow/releases/tag/12.2.0	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.