psd-tools up to 1.17.3 PSD File PSDImage.composite/PSDImage.numpy allocation of resources

Summaryinfo

A vulnerability identified as problematic has been detected in psd-tools up to 1.17.3. Affected by this vulnerability is the function PSDImage.composite/PSDImage.numpy of the component PSD File Handler. The manipulation leads to allocation of resources. This vulnerability is listed as CVE-2026-59991. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in psd-tools up to 1.17.3. This issue affects the function PSDImage.composite/PSDImage.numpy of the component PSD File Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-59991 since 07/07/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.17.4 eliminates this vulnerability.

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Productinfo

Name

• psd-tools

Version

• 1.17.0
• 1.17.1
• 1.17.2
• 1.17.3

Website

• Product: https://github.com/psd-tools/psd-tools/

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