CVE-2026-58486

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Source
https://cve.org/CVERecord?id=CVE-2026-58486
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58486.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-58486
Aliases
  • GHSA-qj78-mjch-wwrv
Published
2026-07-13T22:12:37Z
Modified
2026-08-12T03:51:38Z
Severity
  • 8.3 (High) CVSS_V4 - 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 CVSS Calculator
Summary
HedgeDoc: Denial-of-service via YAML alias expansion in note frontmatter
Details

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/) and, when placed under the opengraph key, the editor view (/). 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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400",
        "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58486.json"
}
References

Affected packages

Git / github.com/hedgedoc/hedgedoc

Affected ranges

Type
GIT
Repo
https://github.com/hedgedoc/hedgedoc
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c489497e451887bfe400434c5a010940051e9890
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.11.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6
0.5.0
1.*
1.0.0-ce
1.0.1-ce
1.1.0-ce
1.1.1-ce
1.10.0
1.10.1
1.10.2
1.10.4
1.10.5
1.10.6
1.10.7
1.10.8
1.2.0
1.2.1
1.3.0
1.3.1
1.3.2
1.4.0
1.5.0
1.6.0
1.7.0
1.7.0-rc1
1.7.0-rc2
1.7.1
1.7.2
1.8.0
1.8.0-rc1
1.8.1
1.8.2
1.9.0
1.9.0-rc1
1.9.1
1.9.2
1.9.3
1.9.4
1.9.5
1.9.6
1.9.7
1.9.8
1.9.9
v0.*
v0.3.3
v0.3.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58486.json"