CVE-2026-109375 Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extraction
Attackers controlling sandboxed code can write arbitrary files on the host via symlink exploitation in tarball extraction, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109375?
CVE-2026-109375 is a medium-severity path traversal vulnerability in Vercel deepsec, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-59
Which versions are affected by CVE-2026-109375?
How do I fix CVE-2026-109375?
No fix has been published for CVE-2026-109375 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-109375 being exploited?
There is no known exploitation of CVE-2026-109375 in the wild and no public exploit code.
Sources
Also known as GHSA-cchp-25pr-r776.