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Vulnerability record · CVE-2021-28677 · published 2 June 2021

CVE-2021-28677: Python pillow vulnerability

Python · Pillow

An issue was discovered in Pillow before 8.2.0. For EPS data, the readline implementation used in EPSImageFile has to deal with any combination of \r and \n as line endings. It used an accidentally quadratic method of accumulating lines while looking for a line ending. A malicious EPS file could use this to perform a DoS of Pillow in the open phase, before an image was accepted for opening.

7.5 CVSS 3.1 High EPSS 2.3% · top 17.1%
7.5CVSS 3.1 base score, v2 5.0
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Pillow before 8.2.0. For EPS data, the readline implementation used in EPSImageFile has to deal with any combination of \r and \n as line endings. It used an accidentally quadratic method of accumulating lines while looking for a line ending. A malicious EPS file could use this to perform a DoS of Pillow in the open phase, before an image was accepted for opening.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python-pillow/Pillow/pull/5377 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGF
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28677-fix-eps-dos-on-open Third Party Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory
https://github.com/python-pillow/Pillow/pull/5377 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGF
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28677-fix-eps-dos-on-open Third Party Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-28677), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.