CVE-2026-44393

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-06-04. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When ssl_ca_file is configured, the driver enables certificate chain validation but does not pass the expected broker hostname into the underlying TLS stack. Any certificate signed by the deployment CA is accepted regardless of hostname, allowing an attacker who can intercept control-plane traffic to impersonate the RabbitMQ broker and perform a man-in-the-middle attack on RPC and notification traffic. All OpenStack services using oslo.messaging with RabbitMQ over TLS are affected.

CVSS v3
7.4
EG Score
7.4(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

June 4, 2026

Last Modified

August 27, 2026

Advisory Details (2)

Auto-updated Jun 9, 2026
No patch confirmed yet.
generic

OSSN/OSSN-0096 - OpenStack

https://wiki.openstack.org/wiki/OSSN/OSSN-0096
generic

Bug #2150316 “[OSSN-0096] oslo.messaging does not verify RabbitM...” : Bugs : oslo.messaging

https://bugs.launchpad.net/oslo.messaging/+bug/2150316

Vendor Advisories for CVE-2026-44393(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
redhatpython-oslo-messaging-0:10.2.4-2.20260710155333.82281a0.el8ost2026-08-13redhat
piposlo.messaging—ghsa

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.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
python-oslo.messaging12.12.0-1 ... 17.3.0-4 (37 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
python-oslo.messaging14.0.0-214.0.3-0+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
python-oslo.messaging16.1.0-316.1.0-3+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-oslo.messaging16.1.0-3 ... 17.3.0-3 (7 versions)17.3.0-4—
PyPI(1)
PackageVulnerable rangeFixed inDependents
oslo-messaging1.10.0 ... 9.8.0 (237 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 47× 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 242 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44393?
CVE-2026-44393 is a high vulnerability published on June 4, 2026. An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When sslcafile is configured, the driver enables certificate chain validation but does not pass the expected…
When was CVE-2026-44393 disclosed?
CVE-2026-44393 was first published in the National Vulnerability Database on June 4, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44393 actively exploited?
CVE-2026-44393 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 93.0% of all scored CVEs.
What is the CVSS score of CVE-2026-44393?
CVE-2026-44393 has a CVSS v3.1 base score of 7.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-44393?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44393, 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.

Dependency Blast Radius

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