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: 1.0%CVSS: 9.1Exploit: None knownExposed services: Not assessed

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
9.1CRITICALmedium confidence
EG Risk
41
EG Risk 41/100

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%
EPSS PROB
1.0%
EPSS %ILE
61st
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.
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33210.json
redhatMentions a patch (unverified)

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
redhatMentions a patch (unverified)

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
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:57565
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:20606
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:20596
githubMentions a patch (unverified)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
ruby-json2.15.2+dfsg-1, 2.18.1+dfsg-1, 2.19.1+dfsg-1, 2.9.1+dfsg-1
  • every version up to 2.19.2+dfsg-1: fixed in 2.19.2+dfsg-1
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
json2.14.0, 2.14.1, 2.15.0, 2.15.1, 2.15.2
  • 2.18.0 up to 2.19.2: fixed in 2.19.2
  • 2.16.0 up to 2.17.1.2: fixed in 2.17.1.2
  • 2.14.0 up to 2.15.2.1: fixed in 2.15.2.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 24× 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 160 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Same vendor

4 shown

redhat:RHSA-2026:20596 · redhat:RHSA-2026:57565

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 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 1.0% probability of exploitation in the next 30 days (61st percentile of EPSS-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?
A fix for CVE-2026-33210 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33210 are linked in the Vendor Advisories panel on this page.

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