# CVE-2026-109375: Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extraction

> CVE-2026-109375: Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extraction. CVSS 6.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-109375
Last updated: 2026-10-16T19:18:44Z

- Published: 2026-10-12 20:55 UTC · Updated: 2026-10-16 19:18 UTC · Assigner: VulnCheck
- CVSS: 6.1 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N
- EPSS: 0.32%, 25th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-59

## 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.

## Affected vendors and products

- Vercel: deepsec

## Tracked companies

- [Vercel](https://rewindex.com/company/vercel.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-109375)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-109375)
- [https://github.com/vercel-labs/deepsec](https://github.com/vercel-labs/deepsec)
- [https://github.com/vercel-labs/deepsec/commit/c5a4e4220ece72aee67c2ea21f4340e65f673fc1](https://github.com/vercel-labs/deepsec/commit/c5a4e4220ece72aee67c2ea21f4340e65f673fc1)
- [https://github.com/vercel-labs/deepsec/pull/46](https://github.com/vercel-labs/deepsec/pull/46)
- [https://github.com/vercel-labs/deepsec/pull/47](https://github.com/vercel-labs/deepsec/pull/47)
- [https://www.vulncheck.com/advisories/vercel-deepsec-before-1.1.17-arbitrary-file-write-via-symlink-in-sandbox-tarball-extraction](https://www.vulncheck.com/advisories/vercel-deepsec-before-1.1.17-arbitrary-file-write-via-symlink-in-sandbox-tarball-extraction)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-109375 · Markdown: https://rewindex.com/cve/CVE-2026-109375.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-109375 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:15.574Z