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CVE-2026-49836— psd-tools: arbitrary file write via smart-object filename

Quick assessment

Affected
psd-tools psd-tools
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

是一个用于处理 Adobe Photoshop PSD 文件的 Python 包。在 1.17.1 版本之前， 方法会将嵌入的智能对象写入一个直接从 PSD 文件中逐字获取的路径。由于该路径由攻击者控制且未经过任何清理或校验，处理不受信任的 文件时，工具可能会被诱导将攻击者指定的字节写入攻击者指定的路径（可以是绝对路径或包含 的路径遍历），从而写入到预期输出目录之外的位置。此外， 在处理外部类型（external-kind）智能对象时存在另一个次要问题：攻击者可控的 描述符可被用作任意文件读取路径，从而将读取到的内

CVSS 4.6 · Medium
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I. Basic Information for CVE-2026-49836

Vulnerability Information
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Vulnerability Title
psd-tools: arbitrary file write via smart-object filename
Source: CVE Program / CVE List V5
Vulnerability Description
psd-tools is a Python package for working with Adobe Photoshop PSD files. Prior to version 1.17.1, `SmartObject.save()` writes an embedded smart object to a path taken verbatim from the PSD file. Because that name is attacker-controlled and unsanitised, a tool that extracts embedded objects from an untrusted `.psd` can be made to write attacker-chosen bytes to an attacker-chosen path (absolute or `../`-traversing), outside its intended output directory. A secondary issue in `SmartObject.open()` for external-kind smart objects allows the attacker-controlled `fullPath` descriptor to be used as an arbitrary file read path, enabling exfiltration of the read content to the controlled write destination. Both issues are fixed in v1.17.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
psd-tools psd-tools < 1.17.1 -

II. Public POCs for CVE-2026-49836

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III. Intelligence Information for CVE-2026-49836

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Other References for CVE-2026-49836 (4)

IV. Related Vulnerabilities

Same product: psd-tools
Same vendor: psd-tools
Same weakness: CWE-22

V. Comments for CVE-2026-49836

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