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CVE-2026-58486— HedgeDoc: Denial-of-service via YAML alias expansion in note frontmatter

Quick assessment

Affected
hedgedoc hedgedoc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HedgeDoc是HedgeDoc团队开源的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.11.0之前版本存在资源管理错误漏洞，该漏洞源于对笔记frontmatter的不安全处理导致YAML别名炸弹，使得恶意有效载荷扩展为巨大的对象结构，消耗大量CPU，导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
hedgedoc hedgedoc < 1.11.0 affected
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I. Basic Information for CVE-2026-58486

Vulnerability Information
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Vulnerability Title
HedgeDoc: Denial-of-service via YAML alias expansion in note frontmatter
Source: CVE Program / CVE List V5
Vulnerability Description
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to version 1.11.0, HedgeDoc was vulnerable to a YAML alias bomb due to unsafe processing of the note frontmatter. HedgeDoc parsed frontmatter with js-yaml.load (js-yaml v3) via @hedgedoc/meta-marked, which resolved YAML anchor aliases. A compact malicious payload could therefore expand into a huge object structure, consuming excessive CPU. This expansion ran on every request to the publish view (/s/<shortid>) and, when placed under the opengraph key, the editor view (/<noteId>). A ten-level alias bomb could block the single Node.js event loop for roughly 235 seconds per request, causing concurrent requests to hang or drop and rendering the instance unavailable (DoS). Because the note was stored in the database, the impact survived process restarts until the note was removed. toobusy-js did not reliably mitigate the worst cases, as the event loop was saturated before the middleware could respond. This issue was fixed in version 1.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
HedgeDoc 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HedgeDoc是HedgeDoc团队开源的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.11.0之前版本存在资源管理错误漏洞，该漏洞源于对笔记frontmatter的不安全处理导致YAML别名炸弹，使得恶意有效载荷扩展为巨大的对象结构，消耗大量CPU，导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hedgedoc hedgedoc < 1.11.0 -

II. Public POCs for CVE-2026-58486

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III. Intelligence Information for CVE-2026-58486

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Patches & Fixes for CVE-2026-58486 (1)

Vendor Advisories for CVE-2026-58486 (1)

Same Patch Batch · hedgedoc · 2026-07-13 · 4 CVEs total

CVE-2026-58487 HedgeDoc: Stored HTML injection via email local-part
CVE-2026-58488 HedgeDoc: Rate-limit bypass via CF-Connecting-IP header spoofing
CVE-2026-58489 HedgeDoc: CSRF in GitHub Gist export callback

IV. Related Vulnerabilities

Same product: hedgedoc
Same vendor: hedgedoc
Same weakness: CWE-400

V. Comments for CVE-2026-58486

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