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Vulnerability record · CVE-2021-40531 · published 6 September 2021

CVE-2021-40531: Sketch unrestricted file upload vulnerability

Sketch · Sketch

Sketch before 75 allows library feeds to be used to bypass file quarantine. Files are automatically downloaded and opened, without the com.apple.quarantine extended attribute. This results in remote code execution, as demonstrated by CommandString in a terminal profile to Terminal.app.

9.8 CVSS 3.1 Critical EPSS 33% · top 1.7% CWE-434 · Unrestricted file upload
9.8CVSS 3.1 base score, v2 7.5
33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Sketch before 75 allows library feeds to be used to bypass file quarantine. Files are automatically downloaded and opened, without the com.apple.quarantine extended attribute. This results in remote code execution, as demonstrated by CommandString in a terminal profile to Terminal.app.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jonpalmisc.com/2021/11/22/cve-2021-40531 ExploitThird Party Advisory
https://www.sketch.com/updates/#version-75 PatchRelease NotesVendor Advisory
https://jonpalmisc.com/2021/11/22/cve-2021-40531 ExploitThird Party Advisory
https://www.sketch.com/updates/#version-75 PatchRelease NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-40531), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.