GitHub Advisoryadvisory · npm
GHSA-c5xx-h28h-f682 obsidian-tc : Symlink read-ACL scope bypass via lexical path checks
MEDIUM
Official page ↗
- Aliases
- CVE-2026-77361
- Ecosystem
- npm
- Packages
- obsidian-tc
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-59, CWE-863
- Reviewed
- 2026-10-23
Affected packages
• npm obsidian-tc: < 1.3.1 → fixed in 1.3.1
Description
Impact
ACL checks ran on the lexical vault-relative path while containment used the realpath. An in-vault symlink placed under an allowed glob, whose realpath resolved into a denied folder, passed the read ACL — an intra-vault read-ACL-scope bypass. It requires an out-of-band-planted symlink (no MCP tool creates one) and is not a vault-root escape.
Patches
Fixed in 1.3.1. Upgrade to `>= 1.3.1`. ACL enforcement now derives the realpath vault-relative path and feeds a single unified predicate at every site.
Workarounds
Do not permit untrusted symlinks inside the vault.
Related
Alias · CVE (1)
- CVE-2026-77361 obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. vulnerability
References
- https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-c5xx-h28h-f682 web
- https://github.com/The-40-Thieves/obsidian-tc/pull/76 web
- https://github.com/The-40-Thieves/obsidian-tc/commit/c81d1687e2cfec98a0d8bc5038c029f41ea9c920 web
- https://github.com/The-40-Thieves/obsidian-tc package
- https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1 web
- https://nvd.nist.gov/vuln/detail/cve-2026-77361 advisory