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

Quick assessment

Affected
Vercel deepsec
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vercel 的 deepsec 组件在 0.1.0 至 1.1.17 版本之间存在一个链接跟踪（link following）漏洞，该漏洞出现在 函数中。攻击者可以通过在结果 tarball 中植入链接，使沙箱内的代码能够绕过沙箱限制，在沙箱外部写入文件。攻击者若控制了沙箱内的代码（例如通过提示词注入攻击操控代码代理），便可在主机数据目录中植入符号链接或硬链接，从而在编排主机上任意写入文件。

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-109375

Vulnerability Information
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Vulnerability Title
Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extraction
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Vercel deepsec 0.1.0 ~ 1.1.17 -

II. Public POCs for CVE-2026-109375

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III. Intelligence Information for CVE-2026-109375

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Patches & Fixes for CVE-2026-109375 (1)

Vendor Advisories for CVE-2026-109375 (1)

IV. Related Vulnerabilities

Same vendor: Vercel
Same weakness: CWE-59

V. Comments for CVE-2026-109375

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