What’s Vulnerable › Vulnerabilities

CVE-2026-59991: psd-tools: Uncontrolled memory allocation in psd-tools composite/numpy via crafted PSD geometry

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-22 · updated 2026-09-23
• Weakness: CWE-789

Description

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 products

• psd-tools: before 1.17.4

References

• https://github.com/psd-tools/psd-tools/commit/a3d9a53ad51e667b5772a4f636ca6f2e16f4b271
• https://github.com/psd-tools/psd-tools/releases/tag/v1.17.4
• https://github.com/psd-tools/psd-tools/security/advisories/GHSA-8q6g-vjhf-jp8m
• https://github.com/psd-tools/psd-tools/security/advisories/GHSA-8q6g-vjhf-jp8m

Get alerted when CVE-2026-59991 or the next vulnerability affects your stack