What’s Vulnerable › Vulnerabilities

CVE-2020-35653

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-12 · updated 2026-06-17
• Weakness: CWE-125

Description

In Pillow before 8.1.0, PcxDecode has a buffer over-read when decoding a crafted PCX file because the user-supplied stride value is trusted for buffer calculations.

Affected products

• Debian Linux: 9.0
• Fedoraproject Fedora: 32, 33
• python-pillow Pillow: before 8.1.0 — fixed in 8.1.0

How to fix

Upgrade to a fixed version: python-pillow Pillow 8.1.0. Check the vendor advisory for mitigations.

References

• https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6BYVI5G44MRIPERKYDQEL3S3YQCZTVHE/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BF553AMNNNBW7SH4IM4MNE4M6GNZQ7YD/
• https://pillow.readthedocs.io/en/stable/releasenotes/index.html
• https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6BYVI5G44MRIPERKYDQEL3S3YQCZTVHE/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BF553AMNNNBW7SH4IM4MNE4M6GNZQ7YD/
• https://pillow.readthedocs.io/en/stable/releasenotes/index.html

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