Vulnerability · Published Oct 19, 2026 · Assigned by GitHub_M
CVE-2026-112400Pillow: GIF seek keeps rejected size after DecompressionBombError, allowing DoS
High 8.7
In plain English
A high-severity uncontrolled resource consumption in Pillow from python-pillow. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Pillow is a Python imaging library. From 9.2.0 until 13.0.0, Pillow can retain a rejected GIF frame size after a decompression-bomb exception. In GifImageFile._seek, a crafted GIF can leave rejected dimensions stored after Image.DecompressionBombError; if an application catches that exception and continues processing the same image object, later seek or load operations allocate according to those dimensions and can exhaust memory, denying service. This issue is fixed in version 13.0.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pillow | no fix listed | DEBIAN-CVE-2026-112400 |
| Debian:13 | pillow | no fix listed | DEBIAN-CVE-2026-112400 |
| Debian:14 | pillow | no fix listed | DEBIAN-CVE-2026-112400 |
| PyPI | pillow | 13.0.0 | GHSA-65qm-jvmh-6pqg |
| Ubuntu:24.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112400 |
| Ubuntu:26.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112400 |
| Ubuntu:26.10 | pillow | no fix listed | UBUNTU-CVE-2026-112400 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| python-pillow | Pillow | >= 9.2.0, < 13.0.0 |
Weakness: CWE-400, CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N