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CVE-2026-62294— Flameshot: OCTOU symlink attack via predictable /tmp path in Flameshot "Open With"

Quick assessment

Affected
flameshot-org flameshot
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.

Flameshot Flameshot是Flameshot公司开源的一款功能丰富的截图工具。 Flameshot 14.0.0之前版本存在安全漏洞，该漏洞源于Open With功能将截图写入可预测的临时路径并遵循符号链接，导致检查时间与使用时间（TOCTOU）竞争条件，可能允许本地低权限攻击者预置符号链接，通过该链接写入PNG数据，覆盖受害用户可写的任意文件。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1491.001 · Internal Defacement

Affected Version Matrix 1

VendorProduct Version RangeStatus
flameshot-org flameshot < 14.0.0 affected
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I. Basic Information for CVE-2026-62294

Vulnerability Information
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Vulnerability Title
Flameshot: OCTOU symlink attack via predictable /tmp path in Flameshot "Open With"
Source: CVE Program / CVE List V5
Vulnerability Description
Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Flameshot 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flameshot Flameshot是Flameshot公司开源的一款功能丰富的截图工具。 Flameshot 14.0.0之前版本存在安全漏洞，该漏洞源于Open With功能将截图写入可预测的临时路径并遵循符号链接，导致检查时间与使用时间（TOCTOU）竞争条件，可能允许本地低权限攻击者预置符号链接，通过该链接写入PNG数据，覆盖受害用户可写的任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
flameshot-org flameshot < 14.0.0 -

II. Public POCs for CVE-2026-62294

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III. Intelligence Information for CVE-2026-62294

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Patches & Fixes for CVE-2026-62294 (2)

Vendor Advisories for CVE-2026-62294 (1)

IV. Related Vulnerabilities

Same weakness: CWE-362

V. Comments for CVE-2026-62294

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