← Vulnerability feed

Vulnerability record · CVE-2026-42309 · published 9 May 2026

CVE-2026-42309: Python pillow heap-based buffer overflow vulnerability

Python · Pillow

Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.

5.1 CVSS 4.0 Medium EPSS 0.18% · top 93.1% CWE-122 · Heap-based buffer overflow
5.1CVSS 4.0 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

Description

Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. 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/releases/tag/12.2.0 ProductRelease Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xmw-vc9v-4wf2 Vendor Advisory

Track CVE-2026-42309 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

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-2026-42309), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.