CVE-2026-59203

Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service

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.

Scores

Weaknesses (CWE)

• CWE-835

Advisories

• GHSA-pg7v-jwj7-p798 — Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service
• PYSEC-2026-3452 — 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

European references

• ENISA EUVD · EUVD-2026-43741
• GCVE · GCVE-0-2026-59203

CERT-FR advisories

• CERTFR-2026-AVI-1366 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1094 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* ≥ 12.0.0 < 12.3.0

Affected products

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

Sources