Medium severity · published Oct 12, 2026
CVE-2026-109375
Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extraction
6.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DE
deepsec · Vercel
0.1.0 before 1.1.17 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109375
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109375
issue-tracking
https://github.com/vercel-labs/deepsec/pull/46
patch
https://github.com/vercel-labs/deepsec/pull/47
patch
https://github.com/vercel-labs/deepsec/commit/c5a4e4220ece72aee67c2ea21f4340e65f673fc1
product
https://github.com/vercel-labs/deepsec
third-party-advisory
https://www.vulncheck.com/advisories/vercel-deepsec-before-1.1.17-arbitrary-file-write-via-symlink-in-sandbox-tarball-extraction