What’s Vulnerable › Vulnerabilities

CVE-2020-10378

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-25 · updated 2026-06-17
• Weakness: CWE-125

Description

In libImaging/PcxDecode.c in Pillow before 7.1.0, an out-of-bounds read can occur when reading PCX files where state->shuffle is instructed to read beyond state->buffer.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 20.04
• Fedoraproject Fedora: 31, 32
• python-pillow Pillow: before 7.1.0 — fixed in 7.1.0

How to fix

Upgrade to a fixed version: python-pillow Pillow 7.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/python-pillow/Pillow/commit/6a83e4324738bb0452fbe8074a995b1c73f08de7#diff-9478f2787e3ae9668a15123b165c23ac
• https://github.com/python-pillow/Pillow/commits/master/src/libImaging
• https://github.com/python-pillow/Pillow/pull/4538
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BEBCPE4F2VHTIT6EZA2YZQZLPVDEBJGD/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HOKHNWV2VS5GESY7IBD237E7C6T3I427/
• https://pillow.readthedocs.io/en/stable/releasenotes/7.1.0.html
• https://usn.ubuntu.com/4430-1/
• https://usn.ubuntu.com/4430-2/
• https://github.com/python-pillow/Pillow/commit/6a83e4324738bb0452fbe8074a995b1c73f08de7#diff-9478f2787e3ae9668a15123b165c23ac
• https://github.com/python-pillow/Pillow/commits/master/src/libImaging
• https://github.com/python-pillow/Pillow/pull/4538
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BEBCPE4F2VHTIT6EZA2YZQZLPVDEBJGD/

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