What’s Vulnerable › Vulnerabilities

CVE-2021-28675: Pillow denial of service

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-02 · updated 2026-06-17
• Weakness: CWE-252

Description

An issue was discovered in Pillow before 8.2.0. PSDImagePlugin.PsdImageFile lacked a sanity check on the number of input layers relative to the size of the data block. This could lead to a DoS on Image.open prior to Image.load.

Affected products

• Fedoraproject Fedora: 33
• python-pillow Pillow: before 8.2.0 — fixed in 8.2.0
• Pypi Pillow: before 8.2.0; 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 (+73) — fixed in 8.2.0

How to fix

Upgrade to a fixed version: python-pillow Pillow 8.2.0; Pypi Pillow 8.2.0. Check the vendor advisory for mitigations.

References

• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/
• https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28675-fix-dos-in-psdimageplugin
• https://security.gentoo.org/glsa/202107-33
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/
• https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28675-fix-dos-in-psdimageplugin
• https://security.gentoo.org/glsa/202107-33

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