CVE-2026-42309
Last modified
CVE-2026-42309 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.13% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Python | Pillow | >= 11.2.1, < 12.2.0 |
References
- https://github.com/python-pillow/Pillow/releases/tag/12.2.0Product, Release Notes
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-42309?
How severe is CVE-2026-42309?
How do I fix CVE-2026-42309?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-42303Fides is an open-source privacy engineering platform. From 2…6.1
- CVE-2026-42304Twisted is an event-based framework for internet application…7.5
- CVE-2026-42305Dulwich is a pure-Python implementation of the Git file form…8.8
- CVE-2026-42306Moby is an open source container framework. In Docker Engine…7.2
- CVE-2026-42307Vim is an open source, command line text editor. Prior to ve…4.4
- CVE-2026-42308Pillow is a Python imaging library. Prior to version 12.2.0,…5.5
- CVE-2026-4231A vulnerability was found in vanna-ai vanna up to 2.0.2. Aff…7.3
- CVE-2026-42310Pillow is a Python imaging library. From version 4.2.0 to be…5.5
- CVE-2026-42311Pillow is a Python imaging library. From version 10.3.0 to b…7.8
- CVE-2026-42312pyLoad is a free and open-source download manager written in…6.8
- CVE-2026-42313pyLoad is a free and open-source download manager written in…8.3
- CVE-2026-42314pyLoad is a free and open-source download manager written in…6.5
Are you affected by CVE-2026-42309?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST