CVE-2026-44838

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 84% 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
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

RabbitMQ is a messaging and streaming broker. From 4.2.0 to before 4.2.4, RabbitMQ's MQTT plugin allows for topic-level authorization using regular expressions with variable substitution. Administrators can create patterns such as ^{client_id}-sensors$ to restrict user access to topics that include their client ID. However, the client_id is provided by the user in the MQTT CONNECT packet and is inserted into the regex pattern without escaping special regex characters. This flaw enables an authenticated MQTT user to inject regex operators to bypass authorization. This vulnerability is fixed in 4.2.4 and 4.3.0.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 4, 2026

Advisory Details (1)

Auto-updated Jun 4, 2026
Patch available. Sources: github.
github Patch Available

RabbitMQ MQTT Topic Permission Authorization Bypass · Advisory · rabbitmq/rabbitmq-server · GitHub

https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x866-xp2g-cx8v

Vendor Advisories for CVE-2026-44838(2)

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
redhatrabbitmq-server4-3-main-4.3.4-0.1.hum12026-07-24redhat
redhatrabbitmq-server4-2-main-4.2.9-0.1.hum12026-07-21redhat

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 8× in last 7d / 36× 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 179 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-44838?
CVE-2026-44838 is a high vulnerability published on May 27, 2026. RabbitMQ is a messaging and streaming broker. From 4.2.0 to before 4.2.4, RabbitMQ's MQTT plugin allows for topic-level authorization using regular expressions with variable substitution. Administrators can create patterns such as ^{clientid}-sensors$ to restrict user access to topics that include…
When was CVE-2026-44838 disclosed?
CVE-2026-44838 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44838 actively exploited?
CVE-2026-44838 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 83.6% of all scored CVEs.
What is the CVSS score of CVE-2026-44838?
CVE-2026-44838 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-44838?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44838, 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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