CVE-2026-112894

UNKNOWN 0.0

Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow takes quadratic time to reserve PDF object identifiers when saving many frames with save_all enabled. PdfParser.next_object_id() repeatedly rebuilds and scans all previously reserved identifiers for every object. An attacker can supply a multi-frame image, including a small APNG with a large declared frame count, to an application that converts it to a multipage PDF. This can consume excessive CPU and deny service. This issue is fixed in version 13.0.0.

CWE	CWE-407
Vendor	python-pillow
Product	pillow
Published	Oct 19, 2026

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Affected Versions

python-pillow / Pillow

>= 5.1.0, < 13.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-jg86-v3jv-hrpm github.com: https://github.com/python-pillow/Pillow/commit/f6a852555f1a1bdff7781abf25f1a3b8bd6ce6cb github.com: https://github.com/python-pillow/Pillow/releases/tag/13.0.0