---
id: CVE-2026-108595
title: >-
  Phi 0.3.0 through 0.28.4 contains a permission bypass vulnerability that
  allows spawned sub-agents to escape workspace_only_writes and readonly mode by
  supplying an unchecked workdir to agent_spawn
summary: >-
  Phi 0.3.0 through 0.28.4 contains a permission bypass vulnerability that
  allows spawned sub-agents to escape workspace_only_writes and readonly mode by
  supplying an unchecked workdir to agent_spawn. Attackers can plant
  prompt-injected in…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N'
cwe:
  - CWE-863
published: '2026-10-10'
updated: '2026-10-10'
sourceUpdated: '2026-10-10T19:16:57.927'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108595'
references:
  - url: 'https://github.com/pulseaiclub/phi'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pulseaiclub/phi/blob/5b3cb440a7c58115ef64283a737a43299f2805a4/internal/agent/engine_runner.go#L52-L60
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pulseaiclub/phi/blob/5b3cb440a7c58115ef64283a737a43299f2805a4/internal/tools/agenttool/agent.go#L106-L120
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@haind/phi-subagent-workdir-workspace-escape'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/phi-0.3.0-through-0.28.4-permission-bypass-via-agent-spawn-workdir
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-10T19:30:07.154Z'
---

## Overview

Phi 0.3.0 through 0.28.4 contains a permission bypass vulnerability that allows spawned sub-agents to escape workspace_only_writes and readonly mode by supplying an unchecked workdir to agent_spawn. Attackers can plant prompt-injected instructions in processed content so the agent spawns a worker rooted elsewhere, causing unapproved file writes anywhere the user can write.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.