high7.5
CVE-2026-112894
Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | Pillow | >= 5.1.0, < 13.0.0 | 13.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Pillow | from 5.1.0 before 13.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jg86-v3jv-hrpm
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-jg86-v3jv-hrpm
- https://nvd.nist.gov/vuln/detail/CVE-2026-112894
- https://github.com/python-pillow/Pillow/commit/f6a852555f1a1bdff7781abf25f1a3b8bd6ce6cb
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0