CVE-2026-59991Public exploitNetwork attack vectorHinoki check available

Service interruption via unchecked PSD buffer allocation

Published Sep 22, 2026 · Updated Sep 22, 2026

Uncontrolled memory allocation in psd-tools before 1.17.4 allows remote attackers to interrupt services via crafted PSD files. PSDImage.composite() and PSDImage.numpy() size output buffers from untrusted header geometry before checking file data or allocation limits. Exposure requires an application to process attacker-supplied PSDs; oversized allocations can trigger an unrecoverable out-of-memory kill.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Uncontrolled memory allocation in psd-tools before 1.17.4 allows remote attackers to interrupt services via crafted PSD files. PSDImage.composite() and PSDImage.numpy() size output buffers from untrusted header geometry before checking file data or allocation limits. Exposure requires an application to process attacker-supplied PSDs; oversized allocations can trigger an unrecoverable out-of-memory kill.

The record

CVE
CVE-2026-59991
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
psd-tools
Product
psd-tools
Classifications
CWE-789, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.17.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

psd-tools · psd-toolsversion=< 1.17.4

Published CVSS scores

7.5psd-toolsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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