CVE-2026-77361

Summary

obsidian-tc : Symlink read-ACL scope bypass via lexical path checks

Severity

medium

CVSS

4.7

EPSS

0.1% (p1)

CWE

CWE-59, CWE-863

Also known as

GHSA-c5xx-h28h-f682

Published

2026-10-23

Updated

2026-10-23

Advisory details

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.

References

• https://github.com/advisories/GHSA-c5xx-h28h-f682
• https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-c5xx-h28h-f682
• https://github.com/The-40-Thieves/obsidian-tc/pull/76
• https://github.com/The-40-Thieves/obsidian-tc/commit/c81d1687e2cfec98a0d8bc5038c029f41ea9c920
• https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1
• https://nvd.nist.gov/vuln/detail/cve-2026-77361

Related advisories

• CVE-2026-77366 — critical · npm/obsidian-tc
• CVE-2026-115478 — high · npm/obsidian-tc
• CVE-2026-115477 — high · npm/obsidian-tc
• CVE-2026-77362 — medium · npm/obsidian-tc
• CVE-2026-77363 — critical · npm/obsidian-tc
• CVE-2026-77364 — medium · npm/obsidian-tc
• GHSA-cxf3-9h37-7rr8#github.com/labstack/echo/v5 — critical · Go/github.com/labstack/echo/v5
• GHSA-cxf3-9h37-7rr8#github.com/labstack/echo/v4 — critical · Go/github.com/labstack/echo/v4

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