CVE-2026-67551

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.

pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service.

This issue affects Apache Qpid Proton-Dotnet: through 1.0.0.

Users are recommended to upgrade to version 1.1.0, 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-2026-67551: Apache Qpid Proton Dotnet: Type size/count handling can lead to excessive allocation pre-authentication

http://www.openwall.com/lists/oss-security/2026/08/04/22
generic
https://lists.apache.org/thread/o566fhkrr3gg0lyzt24xwvz9w94oo6ro

Vendor Advisories for CVE-2026-67551(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatqpid-proton-dotnet2026-09-21redhat

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 24× in last 7d / 96× 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 213 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-67551?
CVE-2026-67551 is a high vulnerability published on August 5, 2026. pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service. This issue affects Apache Qpid Proton-Dotnet: through 1.0.0. Users are recommended to upgrade to version 1.1.0, which fixes the issue.
When was CVE-2026-67551 disclosed?
CVE-2026-67551 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-2026-67551 actively exploited?
CVE-2026-67551 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-2026-67551?
CVE-2026-67551 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-67551?
A fix for CVE-2026-67551 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67551 are linked in the Vendor Advisories panel on this page.

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