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

HedgeDoc: Denial-of-service via YAML alias expansion in note frontmatter

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.

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未加控制的资源消耗(资源穷尽)

HedgeDoc 资源管理错误漏洞

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。

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