CVE-2026-59991

HighCVSS 7.5

Published: 22/09/2026(UTC)Updated: 23/09/2026(UTC)Translated: 23/09/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.52%

41th percentile - higher than 41% of all known CVEs

Summary

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.

Risk Assessment

Memory exhaustion and termination of services processing untrusted PSD files may occur, leading to denial of service.

Recommendation

Update psd-tools to version 1.17.4 or later.

Other vulnerabilities in psd-tools

CVE-2026-49836Medium
psd-tools, a Python package for working with Adobe Photoshop PSD files, prior to version 1.17.1 allows SmartObject.save() to write an embedded smart object to a path taken verbatim from the PSD file. Because that name is attacker-controlled and unsanitised, a tool extracting embedded objects from an untrusted .psd can be made to write attacker-chosen bytes to an attacker-chosen path (absolute or ../-traversing), outside its intended output directory. A secondary issue in SmartObject.open() for external-kind smart objects allows the attacker-controlled fullPath descriptor to be used as an arbitrary file read path, enabling exfiltration of the read content to the controlled write destination. Both issues are fixed in v1.17.1.

Original NVD description (English source)

Vulnerability data from NVD (NIST) · CISA KEV · EPSS