CVE-2026-59991

psd-tools: Uncontrolled memory allocation in psd-tools composite/numpy via crafted PSD geometry

psd-tools is a Python package for working with Adobe Photoshop PSD files. Prior to 1.17.4, PSDImage.composite() and PSDImage.numpy() allocated output buffers from attacker-controlled PSD header geometry, including width, height, channels, depth, and per-layer rectangles, before validating those values against the available file data. A tiny crafted PSD could therefore cause multi-gigabyte memory allocation, and PSDImage.composite() could return a black image with only a warning instead of raising an exception. Services that composite untrusted PSD files could be terminated by out-of-memory handling. This issue is fixed in version 1.17.4.

Affected

psd-tools

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.52% chance of exploitation in the next 30 days, 43rd percentile

Published

2026-09-22

Proof-of-concept exploits (1)

• advisories/GHSA-8q6g-vjhf-jp8m

References

• CVE Record
• NVD entry