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Vulnerability record · CVE-2019-16865 · published 4 October 2019

CVE-2019-16865: Python pillow allocation without limits vulnerability

Python · Pillow

An issue was discovered in Pillow before 6.2.0. When reading specially crafted invalid image files, the library can either allocate very large amounts of memory or take an extremely long period of time to process the image.

7.5 CVSS 3.1 High EPSS 3.1% · top 12.6% CWE-770 · Allocation without limits
7.5CVSS 3.1 base score, v2 5.0
3.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Pillow before 6.2.0. When reading specially crafted invalid image files, the library can either allocate very large amounts of memory or take an extremely long period of time to process the image.

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://access.redhat.com/errata/RHSA-2020:0566
https://access.redhat.com/errata/RHSA-2020:0578
https://access.redhat.com/errata/RHSA-2020:0580
https://access.redhat.com/errata/RHSA-2020:0681
https://access.redhat.com/errata/RHSA-2020:0683
https://access.redhat.com/errata/RHSA-2020:0694
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EMJBUZQGQ2Q7HXYCQVRLU7O
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYDXD7EE4YAEVSTNIFZKNVP
https://pillow.readthedocs.io/en/latest/releasenotes/6.2.0.html Release NotesVendor Advisory
https://usn.ubuntu.com/4272-1/
https://www.debian.org/security/2020/dsa-4631
https://access.redhat.com/errata/RHSA-2020:0566
https://access.redhat.com/errata/RHSA-2020:0578
https://access.redhat.com/errata/RHSA-2020:0580
https://access.redhat.com/errata/RHSA-2020:0681
https://access.redhat.com/errata/RHSA-2020:0683
https://access.redhat.com/errata/RHSA-2020:0694
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EMJBUZQGQ2Q7HXYCQVRLU7O
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYDXD7EE4YAEVSTNIFZKNVP
https://pillow.readthedocs.io/en/latest/releasenotes/6.2.0.html Release NotesVendor Advisory
https://usn.ubuntu.com/4272-1/
https://www.debian.org/security/2020/dsa-4631

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Source: NIST National Vulnerability Database (record CVE-2019-16865), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.