CVE-2026-109375
Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extraction
- State
- Published
- Severity
- 4.9 Medium
- Published
- Oct 12, 2026
- Updated
- Oct 13, 2026
- Reserved
- Oct 12, 2026
Description
Vercel deepsec from 0.1.0 before 1.1.17 contains a link following vulnerability in extractTarballLocally that allows sandboxed code to write files outside the sandbox by planting links in result tarballs. Attackers controlling sandbox code, such as a prompt-injected coding agent, can plant symbolic or hard links in the host data directory to write arbitrary files on the orchestrator host.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.9 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N | VulnCheck |
Weaknesses
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
Affected Products
| Product | Versions |
|---|---|
deepsecVercel |
|
References
- GitHub Pull Request #46issue-trackingpatch
- GitHub Pull Request #47patchissue-tracking
- Patch Commitpatch
- https://github.com/vercel-labs/deepsecproduct
- VulnCheck Advisory: Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extractionthird-party-advisory
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