CVE-2021-40531 in the critical feed json
Sketch before 75 allows library feeds to be used to bypass file quarantine.
published 2021-09-06 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27706
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 33.0%
- EPSS 33.0% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
33.00% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- jonpalmisc.com https://jonpalmisc.com/2021/11/22/cve-2021-40531 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
-
sketch.com
/updates/#version-75
patch, release-notes, vendor-advisory
-
jonpalmisc.com
/2021/11/22/cve-2021-40531
exploit, third-party-advisory
Sources
- CVE List CVE-2021-40531
- NVD CVE-2021-40531
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.