---
id: CVE-2026-50553
title: Note Mark is an open-source note-taking application
summary: >-
  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 i…
severity: high
cwe:
  - CWE-20
  - CWE-22
vendor: enchant97
product: github.com/enchant97/note-mark/backend
affected:
  - github.com/enchant97/note-mark/backend < 0.0.0-20260601210719-67b7de04308a
patched:
  - github.com/enchant97/note-mark/backend 0.0.0-20260601210719-67b7de04308a
published: '2026-09-04'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50553'
references:
  - url: >-
      https://github.com/enchant97/note-mark/commit/67b7de04308a858ef27ceff87b514067b6d667e5
    label: security-advisories@github.com
  - url: 'https://github.com/enchant97/note-mark/releases/tag/v0.19.5'
    label: security-advisories@github.com
  - url: >-
      https://github.com/enchant97/note-mark/security/advisories/GHSA-rqrh-8wpv-x7hh
    label: security-advisories@github.com
  - url: >-
      https://github.com/enchant97/note-mark/security/advisories/GHSA-rqrh-8wpv-x7hh
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-rqrh-8wpv-x7hh'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00459
epssPercentile: 0.39582
aliases:
  - GHSA-rqrh-8wpv-x7hh
ecosystem: go
ingestedAt: '2026-07-09T13:51:05.182Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-50553)

Affected packages:

- `github.com/enchant97/note-mark/backend < 0.0.0-20260601210719-67b7de04308a`

Patched in:

- `github.com/enchant97/note-mark/backend 0.0.0-20260601210719-67b7de04308a`

Source: https://github.com/advisories/GHSA-rqrh-8wpv-x7hh