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: 0.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
54th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 7, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
Patch available.
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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhaf-camel-spring-boot-maven-repository.zip2026-09-24redhat
redhatproton-j2026-09-21redhat
redhatamq-broker-maven-repository.zip2026-09-10redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 125× 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 237 total refreshes for this CVE.

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

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 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 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-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?
A fix for CVE-2026-66274 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66274 are linked in the Vendor Advisories panel on this page.

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