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Vulnerability record · CVE-2021-34552 · published 13 July 2021

CVE-2021-34552: Python pillow classic buffer overflow vulnerability

Python · Pillow

Pillow through 8.2.0 and PIL (aka Python Imaging Library) through 1.1.7 allow an attacker to pass controlled parameters directly into a convert function to trigger a buffer overflow in Convert.c.

9.8 CVSS 3.1 Critical EPSS 3.2% · top 12.4% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score, v2 7.5
3.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

Pillow through 8.2.0 and PIL (aka Python Imaging Library) through 1.1.7 allow an attacker to pass controlled parameters directly into a convert function to trigger a buffer overflow in Convert.c.

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

Affected products

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

References

LinkTags
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7V6LCG525ARIX6LX5QRYNAW
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUGBBT63VL7G4JNOEIPDJIO
https://pillow.readthedocs.io/en/stable/releasenotes/8.3.0.html#buffer-overflow Release NotesVendor Advisory
https://pillow.readthedocs.io/en/stable/releasenotes/index.html Release NotesVendor Advisory
https://security.gentoo.org/glsa/202211-10 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7V6LCG525ARIX6LX5QRYNAW
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUGBBT63VL7G4JNOEIPDJIO
https://pillow.readthedocs.io/en/stable/releasenotes/8.3.0.html#buffer-overflow Release NotesVendor Advisory
https://pillow.readthedocs.io/en/stable/releasenotes/index.html Release NotesVendor Advisory
https://security.gentoo.org/glsa/202211-10 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-34552), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.