CVE-2026-42309

Pillow: Heap buffer overflow with nested list coordinates

CVSS 5.1 MEDIUMEPSS 0.1%CWE-122

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.1EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

09 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

Affected products

python-pillow · Pillow

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References

https://github.com/python-pillow/Pillow/releases/tag/12.2.0 https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xmw-vc9v-4wf2