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TI-2026-70583 Aliases CVE-2026-108599GHSA-mhj6-8rvv-3grj

Symlink path check bypass in phi lets writes escape the workspace

Priority LOW 25CWE-59Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

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

Summary

The phi package by pulseaiclub, versions 0.1.1 through 0.28.4, contains an improper link resolution flaw (CWE-59) because its permission gate checks paths only lexically. A malicious repository can commit symlinks that point outside the workspace, bypassing workspace_only_writes. Using prompt injection, an attacker can make the write tool write attacker-influenced content to those external files without approval.

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

Description from the CNA

phi 0.1.1 through 0.28.4 contains an improper link resolution vulnerability that allows malicious repositories to bypass workspace_only_writes by exploiting lexical-only path checks in the permission gate. Attackers can commit symlinks pointing outside the workspace and use prompt injection to make the write tool write attacker-influenced content to external files without approval.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00172 6th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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
pulseaiclubphi0.1.1 – 0.28.4—No fix listedCNA
  • phi Vendorpulseaiclub Affected 0.1.1 – 0.28.4 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for phi.

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

Timeline

  1. 2026-10-11 Threatist record created from CVE-2026-108599
  2. 2026-10-11 Alias added: GHSA-mhj6-8rvv-3grj
  3. 2026-10-11 Priority changed: MEDIUM → LOW
  4. 2026-10-14 CISA SSVC decision points changed

References

Advisory 1

Other 3

  • TI-2026-70579 Permission bypass in Phi lets spawned sub-agents write outside workspace CVSS 4.0MEDIUM 6.0

Sources

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