CVE-2026-109375 Details
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.
A link following vulnerability has been identified in Vercel Deepsec versions 0.1.0 prior to 1.1.17. This vulnerability resides in the 'extractTarballLocally' function, where sandboxed code can manipulate files outside the designated sandbox environment. By embedding symbolic or hard links in the result tarballs, attackers can redirect to the host data directory and write arbitrary files on the orchestrator host. This exploitation could occur through a prompt-injected coding agent that gains control over the sandboxed environment.
Users can update to Vercel Deepsec version 1.1.17 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 12, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/vercel-labs/deepsec | [email protected] | ProductSource CodeVendor |
| https://github.com/vercel-labs/deepsec/commit/c5a4e4220ece72aee67c2ea21f4340e65f673fc1 | [email protected] | Source CodeVendor |
| https://github.com/vercel-labs/deepsec/pull/46 | [email protected] | Issue TrackingVendor |
| https://github.com/vercel-labs/deepsec/pull/47 | [email protected] | Issue TrackingVendor |
| https://www.vulncheck.com/advisories/vercel-deepsec-before-1.1.17-arbitrary-file-write-via-symlink-in-sandbox-tarball-extraction | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-59 | Improper Link Resolution Before File Access ('Link Following') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Vercel deepsec | >= 0.1.0, < 1.1.17 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 12, 2026 | New CVE Received | [email protected] |