CVE-2026-59870

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 52% 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, nvd
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Jul 8, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Quadratic-complexity (O(n^2)) DoS in js-yaml 5.x via !!omap tag in YAML11_SCHEMA · Advisory · nodeca/js-yaml · GitHub

https://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvm
github_commit

commit 39f3211a2f01 (nodeca/js-yaml)

Fix landed in nodeca/js-yaml commit 39f3211a2f01 — awaiting tagged release

https://github.com/nodeca/js-yaml/commit/39f3211a2f01b3c6982710cf21434ab7060acefe

Vendor Advisories for CVE-2026-59870(9)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnodejs22-main-22.23.1-2.hum12026-07-03redhat
redhatrust-main-1.96.1-1.hum12026-07-02redhat
redhatnodejs24-main-24.18.0-0.2.hum12026-07-01redhat
redhatnodejs26-main-26.4.0-1.3.hum12026-06-30redhat
redhatdotnet8-0-main-8.0.128-1.hum12026-06-18redhat
redhatnodejs20-main-20.20.2-1.hum12026-04-21redhat
redhatyarnpkg-main-1.22.22-18.1.hum12026-04-11redhat
redhatnodejs25-main-25.9.0-1.1.hum12026-04-10redhat

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—5.2.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 109× 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.

Showing the most recent 100 of 159 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-25 11:41 UTCVendor advisory
  3. 2026-08-24 22:30 UTCEG score recompute
  4. 2026-08-24 22:30 UTCVendor advisory
  5. 2026-08-24 09:42 UTCEG score recompute
  6. 2026-08-24 09:42 UTCVendor advisory
  7. 2026-08-23 20:38 UTCVendor advisory
  8. 2026-08-23 07:50 UTCEG score recompute
  9. 2026-08-23 07:50 UTCVendor advisory
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-22 19:01 UTCVendor advisory
  12. 2026-08-22 06:01 UTCEG score recompute
  13. 2026-08-22 06:01 UTCVendor advisory
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 17:13 UTCVendor advisory
  16. 2026-08-21 04:25 UTCEG score recompute
  17. 2026-08-21 04:25 UTCVendor advisory
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-20 15:37 UTCVendor advisory
  20. 2026-08-20 02:00 UTCEG score recompute
  21. 2026-08-20 02:00 UTCVendor advisory
  22. 2026-08-19 17:04 UTCEPSS rescore
  23. 2026-08-19 09:48 UTCVendor advisory
  24. 2026-08-18 20:45 UTCEG score recompute
  25. 2026-08-18 20:45 UTCVendor advisory
Show 75 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-18 02:59 UTCVendor advisory
  3. 2026-08-17 13:54 UTCEG score recompute
  4. 2026-08-17 13:54 UTCVendor advisory
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-17 01:06 UTCEG score recompute
  7. 2026-08-17 01:06 UTCVendor advisory
  8. 2026-08-16 14:56 UTCEPSS rescore
  9. 2026-08-16 12:18 UTCEG score recompute
  10. 2026-08-16 12:18 UTCVendor advisory
  11. 2026-08-16 02:14 UTCEPSS rescore
  12. 2026-08-15 23:31 UTCVendor advisory
  13. 2026-08-15 10:43 UTCEG score recompute
  14. 2026-08-15 10:43 UTCVendor advisory
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-14 21:54 UTCVendor advisory
  17. 2026-08-14 09:07 UTCEG score recompute
  18. 2026-08-14 09:07 UTCVendor advisory
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 20:19 UTCVendor advisory
  21. 2026-08-13 07:32 UTCVendor advisory
  22. 2026-08-12 18:22 UTCEG score recompute
  23. 2026-08-12 18:22 UTCVendor advisory
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 05:25 UTCVendor advisory
  26. 2026-08-11 16:37 UTCEG score recompute
  27. 2026-08-11 16:37 UTCVendor advisory
  28. 2026-08-11 03:48 UTCEG score recompute
  29. 2026-08-11 03:48 UTCVendor advisory
  30. 2026-08-11 00:00 UTCEPSS rescore
  31. 2026-08-10 15:00 UTCVendor advisory
  32. 2026-08-10 02:12 UTCEG score recompute
  33. 2026-08-10 02:12 UTCVendor advisory
  34. 2026-08-09 13:46 UTCEPSS rescore
  35. 2026-08-09 13:24 UTCVendor advisory
  36. 2026-08-09 00:37 UTCEG score recompute
  37. 2026-08-09 00:37 UTCVendor advisory
  38. 2026-08-08 16:37 UTCEPSS rescore
  39. 2026-08-08 11:49 UTCVendor advisory
  40. 2026-08-07 23:02 UTCEG score recompute
  41. 2026-08-07 23:02 UTCVendor advisory
  42. 2026-08-07 10:14 UTCVendor advisory
  43. 2026-08-06 21:26 UTCEG score recompute
  44. 2026-08-06 21:26 UTCVendor advisory
  45. 2026-08-06 13:47 UTCEPSS rescore
  46. 2026-08-06 08:38 UTCVendor advisory
  47. 2026-08-05 19:50 UTCEG score recompute
  48. 2026-08-05 19:50 UTCVendor advisory
  49. 2026-08-05 19:17 UTCEPSS rescore
  50. 2026-08-05 07:02 UTCVendor advisory
  51. 2026-08-04 18:14 UTCEG score recompute
  52. 2026-08-04 18:14 UTCVendor advisory
  53. 2026-08-04 15:10 UTCEPSS rescore
  54. 2026-08-04 10:39 UTCEPSS rescore
  55. 2026-08-04 04:49 UTCVendor advisory
  56. 2026-08-03 16:01 UTCEG score recompute
  57. 2026-08-03 16:01 UTCVendor advisory
  58. 2026-08-03 10:36 UTCEPSS rescore
  59. 2026-08-03 03:13 UTCVendor advisory
  60. 2026-08-02 14:25 UTCEG score recompute
  61. 2026-08-02 14:25 UTCVendor advisory
  62. 2026-08-02 02:27 UTCEPSS rescore
  63. 2026-08-02 01:37 UTCVendor advisory
  64. 2026-08-01 12:49 UTCEG score recompute
  65. 2026-08-01 12:49 UTCVendor advisory
  66. 2026-08-01 04:16 UTCEPSS rescore
  67. 2026-08-01 00:01 UTCVendor advisory
  68. 2026-07-31 11:09 UTCVendor advisory
  69. 2026-07-30 21:53 UTCEG score recompute
  70. 2026-07-30 21:53 UTCVendor advisory
  71. 2026-07-30 16:28 UTCEPSS rescore
  72. 2026-07-30 08:25 UTCEG score recompute
  73. 2026-07-30 08:25 UTCVendor advisory
  74. 2026-07-30 01:30 UTCEPSS rescore
  75. 2026-07-30 01:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-59870?
CVE-2026-59870 is a high vulnerability published on July 8, 2026. js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted…
When was CVE-2026-59870 disclosed?
CVE-2026-59870 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59870 actively exploited?
CVE-2026-59870 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.9% of all scored CVEs.
What is the CVSS score of CVE-2026-59870?
CVE-2026-59870 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59870?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59870, 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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