Vulnerability record · CVE-2021-25289 · published 19 March 2021

CVE-2021-25289: Python pillow out-of-bounds write vulnerability

Python · Pillow

An issue was discovered in Pillow before 8.1.1. TiffDecode has a heap-based buffer overflow when decoding crafted YCbCr files because of certain interpretation conflicts with LibTIFF in RGBA mode. NOTE: this issue exists because of an incomplete fix for CVE-2020-35654.

9.8 CVSS 3.1 Critical EPSS 2.3% · top 17.0% CWE-787 · Out-of-bounds write

9.8CVSS 3.1 base score, v2 7.5

2.3%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References

17 Jun 2026Last modified by NVD

Description

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

Affected products

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

Pillow Python

References

Link	Tags
https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html	Release NotesVendor Advisory
https://security.gentoo.org/glsa/202107-33	Third Party Advisory
https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html	Release NotesVendor Advisory
https://security.gentoo.org/glsa/202107-33	Third Party Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2021-25289), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.