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Vulnerability record · CVE-2021-28678 · published 2 June 2021

CVE-2021-28678: Python pillow insufficient verification of data authenticity vulnerability

Python · Pillow

An issue was discovered in Pillow before 8.2.0. For BLP data, BlpImagePlugin did not properly check that reads (after jumping to file offsets) returned data. This could lead to a DoS where the decoder could be run a large number of times on empty data.

5.5 CVSS 3.1 Medium EPSS 0.73% · top 47.6% CWE-345 · Insufficient verification of data authenticity
5.5CVSS 3.1 base score, v2 4.3
0.73%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Pillow before 8.2.0. For BLP data, BlpImagePlugin did not properly check that reads (after jumping to file offsets) returned data. This could lead to a DoS where the decoder could be run a large number of times on empty data.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGF
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28678-fix-blp-dos Release NotesVendor Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory
https://github.com/python-pillow/Pillow/pull/5377 PatchThird 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-2021-28678-fix-blp-dos Release NotesVendor Advisory
https://security.gentoo.org/glsa/202107-33 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-28678), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.