CVE-2026-42462

HIGHPre-NVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 93% 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
7.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.0Exploit: NoneExposed: 0

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

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.

CVSS v3
7.0
EG Score
7.0(medium)
EPSS
6.7%
KEV
Not listed

Published

May 26, 2026

Last Modified

June 11, 2026

Advisory Details (2)

Auto-updated Jun 11, 2026
Patch available. Sources: github_release, github.
github Patch Available

Linked Data Signature Bypass via JSON-LD Named-Graph Restructuring · Advisory · fedify-dev/fedify · GitHub

https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
github_release Patch Available

Fedify 2.2.3

Patch available: fedify-dev/fedify 2.2.3

https://github.com/fedify-dev/fedify/releases/tag/2.2.3

Vendor Advisories for CVE-2026-42462(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@fedify/fedify—1.9.11—

Weakness Classification(4)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 47× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-09 19:10 UTCEPSS rescore
  7. 2026-07-08 15:15 UTCEPSS rescore
  8. 2026-07-07 13:46 UTCEPSS rescore
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 02:23 UTCEPSS rescore
  12. 2026-07-06 02:23 UTCEPSS rescore
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-01 15:06 UTCEPSS rescore
  16. 2026-07-01 12:00 UTCEG score recompute
  17. 2026-06-30 23:22 UTCEPSS rescore
  18. 2026-06-29 14:46 UTCEG score recompute
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-28 22:31 UTCEG score recompute
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 08:30 UTCEG score recompute
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-27 19:49 UTCEG score recompute
  25. 2026-06-27 06:58 UTCEG score recompute
Show 56 more
  1. 2026-06-27 03:08 UTCEPSS rescore
  2. 2026-06-26 17:28 UTCEG score recompute
  3. 2026-06-25 23:03 UTCEG score recompute
  4. 2026-06-25 13:49 UTCEPSS rescore
  5. 2026-06-25 13:49 UTCEPSS rescore
  6. 2026-06-25 09:46 UTCEG score recompute
  7. 2026-06-24 14:05 UTCEPSS rescore
  8. 2026-06-23 21:33 UTCEPSS rescore
  9. 2026-06-22 14:25 UTCEPSS rescore
  10. 2026-06-22 14:25 UTCEPSS rescore
  11. 2026-06-21 14:56 UTCEPSS rescore
  12. 2026-06-21 14:56 UTCEPSS rescore
  13. 2026-06-21 01:59 UTCEPSS rescore
  14. 2026-06-19 19:25 UTCEPSS rescore
  15. 2026-06-18 17:52 UTCEPSS rescore
  16. 2026-06-18 17:52 UTCEPSS rescore
  17. 2026-06-17 19:10 UTCEG score recompute
  18. 2026-06-17 17:53 UTCEPSS rescore
  19. 2026-06-17 05:16 UTCEG score recompute
  20. 2026-06-16 17:52 UTCEPSS rescore
  21. 2026-06-16 16:37 UTCEG score recompute
  22. 2026-06-16 02:20 UTCEG score recompute
  23. 2026-06-15 17:49 UTCEPSS rescore
  24. 2026-06-15 13:40 UTCEG score recompute
  25. 2026-06-14 22:22 UTCEG score recompute
  26. 2026-06-14 09:42 UTCEG score recompute
  27. 2026-06-13 23:00 UTCEPSS rescore
  28. 2026-06-13 21:03 UTCEG score recompute
  29. 2026-06-13 05:20 UTCEG score recompute
  30. 2026-06-12 23:12 UTCEPSS rescore
  31. 2026-06-12 23:12 UTCEPSS rescore
  32. 2026-06-12 16:39 UTCEG score recompute
  33. 2026-06-12 03:57 UTCEG score recompute
  34. 2026-06-11 15:17 UTCEG score recompute
  35. 2026-06-11 14:00 UTCEPSS rescore
  36. 2026-06-11 02:36 UTCEG score recompute
  37. 2026-06-10 13:56 UTCEG score recompute
  38. 2026-06-10 01:17 UTCEG score recompute
  39. 2026-06-09 12:37 UTCEG score recompute
  40. 2026-06-08 23:57 UTCEG score recompute
  41. 2026-06-08 11:17 UTCEG score recompute
  42. 2026-06-07 22:37 UTCEG score recompute
  43. 2026-06-07 09:57 UTCEG score recompute
  44. 2026-06-06 21:17 UTCEG score recompute
  45. 2026-06-06 08:37 UTCEG score recompute
  46. 2026-06-05 19:57 UTCEG score recompute
  47. 2026-06-05 07:17 UTCEG score recompute
  48. 2026-06-04 18:37 UTCEG score recompute
  49. 2026-06-04 05:57 UTCEG score recompute
  50. 2026-06-03 17:17 UTCEG score recompute
  51. 2026-06-03 04:37 UTCEG score recompute
  52. 2026-06-02 15:56 UTCEG score recompute
  53. 2026-06-02 03:16 UTCEG score recompute
  54. 2026-06-01 14:36 UTCEG score recompute
  55. 2026-06-01 01:57 UTCEG score recompute
  56. 2026-05-27 00:14 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-42462?
CVE-2026-42462 is a high vulnerability published on May 26, 2026. Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its…
When was CVE-2026-42462 disclosed?
CVE-2026-42462 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on June 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42462 actively exploited?
CVE-2026-42462 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42462?
CVE-2026-42462 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2026-42462?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42462, 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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