CVE-2026-33210

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 45% 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

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
Severity91% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

March 20, 2026

Last Modified

August 21, 2026

Advisory Details (7)

Auto-updated Sep 15, 2026
Patch available. Sources: redhat, github.
redhat Patch Available

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33210.json
redhat Patch Available

2449871 – (CVE-2026-33210) CVE-2026-33210 ruby/json: Ruby JSON: Denial of Service or Information Disclosure via format string injection

Affected: Red Hat Enterprise Linux 10

https://bugzilla.redhat.com/show_bug.cgi?id=2449871
redhat Patch Available

CVE-2026-33210 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 9.9 (ruby:4.0/ruby), Red Hat Enterprise Linux 10.3 (ruby4.0), and Insights (cloudservices/compliance-

https://access.redhat.com/security/cve/CVE-2026-33210
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:57565
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:20606
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:20596
github Patch Available

Format string injection vulnerability · Advisory · ruby/json · GitHub

https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3

Vendor Advisories for CVE-2026-33210(3)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatruby4-0-main-4.0.6-37.2.hum12026-08-20redhat
redhatruby4.0-0:4.0.3-34.el10_22026-05-26redhat
redhatruby:4.0-9080020260513131334.92026-05-26redhat

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

(2 across 2 ecosystems)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ruby-json2.15.2+dfsg-1, 2.18.1+dfsg-1, 2.19.1+dfsg-1, 2.9.1+dfsg-12.19.2+dfsg-1—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
json2.14.0, 2.14.1, 2.15.0, 2.15.1, 2.15.22.15.2.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 34× 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 145 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-33210?
CVE-2026-33210 is a critical vulnerability published on March 20, 2026. Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allowduplicatekey: false parsing option is used to parse user…
When was CVE-2026-33210 disclosed?
CVE-2026-33210 was first published in the National Vulnerability Database on March 20, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33210 actively exploited?
CVE-2026-33210 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 43.2% of all scored CVEs.
What is the CVSS score of CVE-2026-33210?
CVE-2026-33210 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-33210?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33210, 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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