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TI-2026-22318 Aliases CVE-2026-27976

Zed Extension Sandbox Escape via Tar Symlink Following

Priority HIGH 73CWE-61Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Zed, a code editor, has an extension installer allows tar/gzip downloads. Prior to version 0.224.4, the tar extractor (`async_tar::Archive::unpack`) creates symlinks from the archive without validation, and the path guard (`writeable_path_from_extension`) only performs lexical prefix checks without resolving symlinks. An attacker can ship a tar that first creates a symlink inside the extension workdir pointing outside (e.g., `escape -> /`), then writes files through the symlink, causing writes to arbitrary host paths. This escapes the extension sandbox and enables code execution. Version 0.224.4 patches the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00692 53rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed zed (zed-industries): 0.224.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
zed-industrieszedbefore 0.224.40.224.4Patch availableCNA
  • zed Vendorzed-industries Affected before 0.224.4 Fixed in 0.224.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:zed:zed:*:*:*:*:*:*:*:*before 0.224.4Vulnerablezed-industries
  • cpe:2.3:a:zed:zed:*:*:*:*:*:*:*:* Versions before 0.224.4 Vulnerable ·zed-industries

Remediation

  • Fix · CNA zed (zed-industries) Fixed in 0.224.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27976

References

Exploit 1

  • TI-2026-32402 Zed: Allowlist Bypass via Bash Variable Expansion Chain in Terminal Tool Permissions CVSS 3.1HIGH 8.8
  • TI-2026-32405 Zed: Allowlist Bypass via Bash Arithmetic Expansion in Terminal Tool Permissions CVSS 3.1HIGH 8.6
  • TI-2026-32404 Zed: Zed IDE Arbitrary Code Execution via untrusted repository with poisoned .git/config CVSS 3.1HIGH 8.6
  • TI-2026-32403 Zed: Allowlist Bypass via Environment Variable Injection in Terminal Tool Permissions CVSS 3.1HIGH 8.6
  • TI-2026-32401 Zed: Remote Command Injection via Unquoted Environment Variable Keys (SSH / WSL Remote) CVSS 3.1HIGH 8.6
  • TI-2026-20868 Zed does not show Parameter Values for MCP Tool Calls. Users cannot detect tool poisoning. CVSS 3.1HIGH 8.0
See all 10 →

Sources

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