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TI-2026-71278 Aliases CVE-2026-109375GHSA-cchp-25pr-r776

Arbitrary file write via symlink in Vercel deepsec

Priority LOW 22CWE-59Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Vercel deepsec from 0.1.0 before 1.1.17 contains a link following flaw in extractTarballLocally (CWE-59). Code running in a sandbox, such as a prompt-injected coding agent, can plant symbolic or hard links in result tarballs. Those links let it write arbitrary files outside the sandbox on the orchestrator host.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00322 25th percentileScored 2026-11-07
Fix Fixed deepsec (Vercel): 1.1.17

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
verceldeepsec0.1.0 to before 1.1.171.1.17Patch availableCNA
  • deepsec Vendorvercel Affected 0.1.0 to before 1.1.17 Fixed in 1.1.17 Patch available CNA

Remediation

Upgrade Vercel deepsec to version 1.1.17, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA deepsec (Vercel) Fixed in 1.1.17

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109375
  2. 2026-10-13 Alias added: GHSA-cchp-25pr-r776
  3. 2026-10-13 CISA SSVC decision points changed

References

Patch 3

Other 1

  • TI-2025-34861 Deserialization of untrusted data in Meta react-server-dom-webpack KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-21309 Authorization Bypass in Next.js Middleware CVSS 3.1CRITICAL 9.1
  • TI-2024-15745 An issue in Hyper on macOS version 3.4.1 and before, allows remote attackers to execute… CVSS 3.1CRITICAL 9.8
  • TI-2025-34863 Deserialization of untrusted data in Meta react-server-dom-webpack CVSS 3.1HIGH 7.5
  • TI-2024-31371 Cache Poisoning in next.js CVSS 3.1HIGH 7.5
  • TI-2023-24914 Next.js before 13.4.20-canary.13 lacks a cache-control header and thus empty prefetch… CVSS 3.1HIGH 7.5
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences