psd-tools: Uncontrolled memory allocation in psd-tools composite/numpy via crafted PSD geometry (CVE-2026-59991) | HOL Guard CVE

High · CVSS 7.5CVE-2026-59991GHSA-8Q6G-VJHF-JP8M

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

Answer in brief

CVE-2026-59991 records a High severity (CVSS 7.5) vulnerability in psd-tools: Uncontrolled memory allocation in psd-tools composite/numpy via crafted PSD geometry. The current sources do not mark it as known exploited. The current feed maps psd-tools/psd-tools (generic), psd-tools (pip), psd-tools (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps psd-tools/psd-tools (generic), psd-tools (pip), psd-tools (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
psd-tools/psd-toolsgeneric	<1.17.4	1.17.4
psd-toolspip	<1.17.4	1.17.4
psd-toolspypi	>=0 <1.17.4	1.17.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for psd-tools/psd-tools, psd-tools, psd-tools.
Review the reported fix. Update psd-tools/psd-tools to 1.17.4; psd-tools to 1.17.4; psd-tools to 1.17.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.