CVE-2026-53550

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 83% of all CVEs by exploit prediction. 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: epss, secondary
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
17.3%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Quadratic-complexity DoS in merge key handling via repeated aliases · Advisory · nodeca/js-yaml · GitHub

https://github.com/nodeca/js-yaml/security/advisories/GHSA-h67p-54hq-rp68

Vendor Advisories for CVE-2026-53550(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnodejs26-main-26.4.0-1.3.hum12026-06-30redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
js-yaml—4.2.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 43× 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. 2026-07-07 00:21 UTCEG score recompute
  2. 2026-07-07 00:21 UTCVendor advisory
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 12:09 UTCEG score recompute
  8. 2026-07-05 12:09 UTCVendor advisory
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 10:03 UTCEG score recompute
  12. 2026-07-04 10:03 UTCVendor advisory
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 04:09 UTCEG score recompute
  16. 2026-07-02 02:00 UTCEG score recompute
  17. 2026-07-01 15:07 UTCEPSS rescore
  18. 2026-06-30 23:56 UTCEG score recompute
  19. 2026-06-30 23:22 UTCEPSS rescore
  20. 2026-06-29 21:45 UTCEG score recompute
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-28 19:40 UTCEG score recompute
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 18 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-27 17:35 UTCEG score recompute
  3. 2026-06-27 03:08 UTCEPSS rescore
  4. 2026-06-26 15:30 UTCEG score recompute
  5. 2026-06-25 13:49 UTCEPSS rescore
  6. 2026-06-25 13:26 UTCEG score recompute
  7. 2026-06-24 14:05 UTCEPSS rescore
  8. 2026-06-24 11:21 UTCEG score recompute
  9. 2026-06-23 21:33 UTCEPSS rescore
  10. 2026-06-23 21:33 UTCEPSS rescore
  11. 2026-06-23 09:14 UTCEG score recompute
  12. 2026-06-22 07:11 UTCEG score recompute
  13. 2026-06-21 04:42 UTCEG score recompute
  14. 2026-06-20 02:21 UTCEG score recompute
  15. 2026-06-19 00:07 UTCEG score recompute
  16. 2026-06-17 21:56 UTCEG score recompute
  17. 2026-06-16 19:51 UTCEG score recompute
  18. 2026-06-15 17:46 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53550?
CVE-2026-53550 is a medium vulnerability published on June 15, 2026. js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size…
When was CVE-2026-53550 disclosed?
CVE-2026-53550 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53550 actively exploited?
CVE-2026-53550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53550?
CVE-2026-53550 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-53550?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53550, 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.

Dependency Blast Radius

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