open-multi-agent 1.5.0 through 1.21.2 Sandbox Escape via file_write Dangling Symlink

Advisories

open-multi-agent 1.5.0 through 1.21.2 Sandbox Escape via file_write Dangling Symlink

severity: medium
date: 10/10/2026
Affecting: open-multi-agent >= 1.5.0, <= 1.21.2
CVE: CVE-2026-108600
CWE: CWE-59 Improper Link Resolution Before File Access ('Link Following')
CVSS: 5.7
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
References: https://hackmd.io/@haind/open-multi-agent-file-write-dangling-symlink-escape
https://github.com/open-multi-agent/open-multi-agent/blob/6ec5498643c7e431aa66751f17f47a529e7f927c/packages/core/src/tool/built-in/path-safety.ts#L104-L113
https://github.com/open-multi-agent/open-multi-agent/blob/6ec5498643c7e431aa66751f17f47a529e7f927c/packages/core/src/tool/built-in/file-write.ts#L67
https://github.com/open-multi-agent/open-multi-agent
Credit: HaiND from the Post and Telecommunication Institute of Technology
Description: open-multi-agent (@open-multi-agent/core) 1.5.0 through 1.21.2 contains a link following vulnerability in the file_write tool sandbox that allows attackers to create files outside the workspace root by using dangling symlinks. Attackers can plant a dangling symlink in the workspace and steer the agent via prompt injection to write attacker-influenced content anywhere the agent process can write.

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