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Vulnerability record · CVE-2026-42310 · published 9 May 2026

CVE-2026-42310: Python pillow vulnerability

Python · Pillow

Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.

5.1 CVSS 4.0 Medium EPSS 0.18% · top 93.5% CWE-835 · CWE-835
5.1CVSS 4.0 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
24 Jul 2026Last modified by NVD

Description

Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468 Patch
https://github.com/python-pillow/Pillow/pull/9519 Issue TrackingPatch
https://github.com/python-pillow/Pillow/releases/tag/12.2.0 ProductRelease Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7 PatchVendor Advisory

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Related vulnerabilities

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

10.0CVE-2014-3007Python pillow os command injection vulnerabilityPython Image Library (PIL) 1.1.7 and earlier and Pillow 2.3 might allow remote attackers to execute arbitrary commands via shell metacharacters in un…EPSS 12%9.8CVE-2022-30595Python pillow out-of-bounds write vulnerabilitylibImaging/TgaRleDecode.c in Pillow 9.1.0 has a heap buffer overflow in the processing of invalid TGA image files.EPSS 2.3%9.8CVE-2022-22817Python pillow vulnerabilityPIL.ImageMath.eval in Pillow before 9.0.0 allows evaluation of arbitrary expressions, such as ones that use the Python exec method. A lambda expressi…EPSS 3.3%9.8CVE-2021-34552Python pillow classic buffer overflow vulnerabilityPillow 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 funct…EPSS 3.2%9.8CVE-2021-25289Python pillow out-of-bounds write vulnerabilityAn issue was discovered in Pillow before 8.1.1. TiffDecode has a heap-based buffer overflow when decoding crafted YCbCr files because of certain inte…EPSS 2.3%9.8CVE-2020-5311Python pillow classic buffer overflow vulnerabilitylibImaging/SgiRleDecode.c in Pillow before 6.2.2 has an SGI buffer overflow.EPSS 4.2%9.8CVE-2020-5312Python pillow classic buffer overflow vulnerabilitylibImaging/PcxDecode.c in Pillow before 6.2.2 has a PCX P mode buffer overflow.EPSS 3.7%9.8CVE-2016-4009Python pillow memory buffer overflow vulnerabilityInteger overflow in the ImagingResampleHorizontal function in libImaging/Resample.c in Pillow before 3.1.1 allows remote attackers to have unspecifie…EPSS 7.9%

Source: NIST National Vulnerability Database (record CVE-2026-42310), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.