CVE-2026-66274

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial of service.

This issue affects Apache Qpid Proton-J: through 0.34.1.

Users are recommended to upgrade to version 0.35.0, which fixes the issue.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 7, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-66274: Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow

http://www.openwall.com/lists/oss-security/2026/08/04/10
generic
https://lists.apache.org/thread/h7xolzws2by2qhdjf7scbx87foxojb5h

Vendor Advisories for CVE-2026-66274(4)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatamq-broker-maven-repository.zip2026-09-10redhat
redhatproton-j2026-09-03redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 34× in last 7d / 122× 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 181 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-66274?
CVE-2026-66274 is a high vulnerability published on August 5, 2026. A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial of service. This issue affects Apache Qpid Proton-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.
When was CVE-2026-66274 disclosed?
CVE-2026-66274 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66274 actively exploited?
CVE-2026-66274 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 58.6% of all scored CVEs.
What is the CVSS score of CVE-2026-66274?
CVE-2026-66274 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-66274?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66274, 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.

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