CVE-2026-66276

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-05. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, 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
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
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-2026-66276: Apache Qpid Proton-J: Unbounded disposition range handling can lead to denial of service

http://www.openwall.com/lists/oss-security/2026/08/04/12
generic
https://lists.apache.org/thread/14nj0lpsqpnd3q0hw0t0tw44qvdo1jc2

Vendor Advisories for CVE-2026-66276(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 70× 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 117 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-66276?
CVE-2026-66276 is a medium vulnerability published on August 5, 2026. An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, 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…
When was CVE-2026-66276 disclosed?
CVE-2026-66276 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-2026-66276 actively exploited?
CVE-2026-66276 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 63.9% of all scored CVEs.
What is the CVSS score of CVE-2026-66276?
CVE-2026-66276 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-66276?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66276, 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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