CVE-2026-58486

HIGHPre-NVD 8.38.3
EchelonGraph scoreLOW confidence

This high-severity CVE scores 8.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: secondary
8.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 8.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.3
EG Score
8.3(low)
EPSS
—
KEV
Not listed

Published

July 13, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Jul 14, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Denial-of-service via YAML alias expansion in note frontmatter · Advisory · hedgedoc/hedgedoc · GitHub

https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-qj78-mjch-wwrv
github_commit Patch Available

commit c489497e4518 (hedgedoc/hedgedoc)

Patch available: hedgedoc/hedgedoc 1.11.0 (contains commit c489497e4518)

https://github.com/hedgedoc/hedgedoc/commit/c489497e451887bfe400434c5a010940051e9890

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 3× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-14 10:47 UTCEG score recompute
  2. 2026-07-13 22:28 UTCEG score recompute
  3. 2026-07-13 22:27 UTCMITRE cvelistV5first tracked

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Frequently asked(4)

What is CVE-2026-58486?
CVE-2026-58486 is a high vulnerability published on July 13, 2026. 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…
When was CVE-2026-58486 disclosed?
CVE-2026-58486 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-58486?
CVE-2026-58486 has a CVSS v3 base score of 8.3 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-58486?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58486, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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