CVE-2026-108595

Description

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.

References

• https://github.com/pulseaiclub/phi
• https://github.com/pulseaiclub/phi/blob/5b3cb440a7c58115ef64283a737a43299f2805a4/internal/agent/engine_runner.go#L52-L60
• https://github.com/pulseaiclub/phi/blob/5b3cb440a7c58115ef64283a737a43299f2805a4/internal/tools/agenttool/agent.go#L106-L120
• https://hackmd.io/@haind/phi-subagent-workdir-workspace-escape
• https://www.vulncheck.com/advisories/phi-0.3.0-through-0.28.4-permission-bypass-via-agent-spawn-workdir