Psd tools: Prior to 1.17.4, PSDImage.composite() and PSDImage.numpy() allocated output buffers from attacker-controlled PSD header geometry, including width,… (CVE-2026-59991)
Description
psd-tools versions prior to 1.17.4 have a vulnerability in PSDImage.composite() and PSDImage.numpy() where output buffers are allocated based on attacker-controlled PSD header geometry without proper validation. This can lead to excessive memory allocation and potential denial of service due to out-of-memory conditions. The issue is fixed in version 1.17.4.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/psd-tools?arch=source&distro=noblepkg:deb/ubuntu/psd-tools?arch=source&distro=stonkingpkg:deb/ubuntu/psd-tools?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Python package psd-tools, used for handling Adobe Photoshop PSD files, contains a vulnerability in versions before 1.17.4. Specifically, the functions PSDImage.composite() and PSDImage.numpy() allocate output buffers using dimensions and parameters (width, height, channels, depth, and per-layer rectangles) derived from the PSD header before validating these values against the actual file data. An attacker can craft a PSD file with malicious header geometry to cause multi-gigabyte memory allocations, potentially exhausting system memory and causing service termination. Additionally, PSDImage.composite() may return a black image with only a warning instead of raising an exception, which could mask the issue. This vulnerability is addressed in version 1.17.4.
Potential Impact
This vulnerability can cause denial of service by exhausting system memory when processing specially crafted PSD files, leading to service termination or crashes. There is no impact on confidentiality or integrity reported. The CVSS score is 7.5 (high impact on availability).
Mitigation Recommendations
Upgrade to psd-tools version 1.17.4 or later, where this issue is fixed. No other mitigations are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-59991
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6ad3f5d52cdf04f656662ded
Added to database: 10/17/2026, 22:25:25 UTC
Last enriched: 10/18/2026, 00:28:07 UTC
Last updated: 10/18/2026, 00:28:07 UTC
Views: 2
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