CVE-2026-63336

MEDIUMPre-NVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (21st percentile of EPSS-scored CVEs). 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, secondary
Elevated
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, com.rabbitmq.client.ConnectionFactory.useSslProtocol() and ConnectionFactory.useSslProtocol(String) configure com.rabbitmq.client.TrustEverythingTrustManager and leave hostname verification disabled, causing arbitrary server certificates, including self-signed certificates, to be accepted. A network attacker able to intercept a TLS connection can impersonate the RabbitMQ broker, read protected AMQP traffic, and modify traffic without certificate or hostname validation. The fix changes the production TLS helpers to use the JVM default trust store and enables hostname verification, while retaining an explicitly named development-only no-verification helper. This issue is fixed in version 5.33.0.

CVSS v3
5.1
EG Score
5.1MEDIUMmedium 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
Severity51% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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 18, 2026

Last Modified

September 10, 2026

Advisory Details (6)

Auto-updated Aug 18, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

5.33.0

Patch available: rabbitmq/rabbitmq-java-client v5.33.0

https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.0
github_commit

commit a4bf571dd368 (rabbitmq/rabbitmq-java-client)

Fix landed in rabbitmq/rabbitmq-java-client commit a4bf571dd368 — awaiting tagged release

https://github.com/rabbitmq/rabbitmq-java-client/commit/a4bf571dd368765baaa9cecfae68ce09f1bdcc01
github_commit Patch Available

commit 1e7deb2e6020 (rabbitmq/rabbitmq-java-client)

Patch available: rabbitmq/rabbitmq-java-client v5.33.0 (contains commit 1e7deb2e6020)

https://github.com/rabbitmq/rabbitmq-java-client/commit/1e7deb2e6020c9793a81385a53ea378ec63b9339
github_pr Patch Available

Introduce helper for dev/test TLS setup (backport #1999)

Patch available: rabbitmq/rabbitmq-java-client v5.33.0 (PR #2001 merged 2026-06-30)

https://github.com/rabbitmq/rabbitmq-java-client/pull/2001
github_pr

Introduce helper for dev/test TLS setup

Fix merged in rabbitmq/rabbitmq-java-client PR #1999 on 2026-06-29 — awaiting tagged release

https://github.com/rabbitmq/rabbitmq-java-client/pull/1999
github Patch Available🟡 PoC Available

TrustEverythingTrustManager used by default in useSslProtocol() enables MITM · Advisory · rabbitmq/rabbitmq-java-client · GitHub

https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-5m9f-rphj-c435

Vendor Advisories for CVE-2026-63336(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
rabbitmq-java-client5.0.0-1.1, 5.0.0-2
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rabbitmq-java-client5.0.0-1.1, 5.0.0-2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rabbitmq-java-client5.0.0-1.1, 5.0.0-2
  • every version on: no fix on record
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
com.rabbitmq:amqp-client1.3.0 ... 5.9.0 (150 versions)
  • every version up to 5.33.0: fixed in 5.33.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 41× 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.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-03 17:38 UTCEG score recompute
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-02 17:56 UTCEPSS rescore
  5. 2026-10-02 08:37 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-10-01 09:12 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-30 09:48 UTCEG score recompute
  10. 2026-09-29 06:44 UTCEG score recompute
  11. 2026-09-28 13:51 UTCEPSS rescore
  12. 2026-09-28 07:20 UTCEG score recompute
  13. 2026-09-27 07:56 UTCEG score recompute
  14. 2026-09-26 15:59 UTCEPSS rescore
  15. 2026-09-25 01:27 UTCEG score recompute
  16. 2026-09-23 20:20 UTCEG score recompute
  17. 2026-09-23 17:54 UTCEPSS rescore
  18. 2026-09-22 20:25 UTCEG score recompute
  19. 2026-09-20 20:43 UTCEG score recompute
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-19 21:15 UTCEG score recompute
  22. 2026-09-18 21:51 UTCEG score recompute
  23. 2026-09-18 19:28 UTCEPSS rescore
  24. 2026-09-17 21:51 UTCEG score recompute
  25. 2026-09-16 21:56 UTCEG score recompute
Show 51 more
  1. 2026-09-16 14:08 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 19:09 UTCEG score recompute
  4. 2026-09-13 19:07 UTCEG score recompute
  5. 2026-09-12 19:42 UTCEG score recompute
  6. 2026-09-11 20:17 UTCEG score recompute
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 09:37 UTCEPSS rescore
  9. 2026-09-10 20:38 UTCEG score recompute
  10. 2026-09-09 03:25 UTCEG score recompute
  11. 2026-09-08 22:01 UTCEPSS rescore
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-07 10:25 UTCEG score recompute
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-06 09:57 UTCEG score recompute
  16. 2026-09-05 15:31 UTCEPSS rescore
  17. 2026-09-05 10:33 UTCEG score recompute
  18. 2026-09-04 11:07 UTCEG score recompute
  19. 2026-09-04 05:07 UTCEPSS rescore
  20. 2026-09-03 11:11 UTCEG score recompute
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-02 11:46 UTCEG score recompute
  23. 2026-09-01 13:54 UTCEPSS rescore
  24. 2026-09-01 12:02 UTCEG score recompute
  25. 2026-09-01 04:40 UTCEPSS rescore
  26. 2026-08-31 12:35 UTCEG score recompute
  27. 2026-08-30 19:17 UTCEPSS rescore
  28. 2026-08-30 13:03 UTCEG score recompute
  29. 2026-08-30 01:22 UTCEPSS rescore
  30. 2026-08-29 13:39 UTCEG score recompute
  31. 2026-08-28 21:42 UTCEPSS rescore
  32. 2026-08-28 13:04 UTCEG score recompute
  33. 2026-08-27 14:25 UTCEPSS rescore
  34. 2026-08-27 13:38 UTCEG score recompute
  35. 2026-08-26 14:46 UTCEPSS rescore
  36. 2026-08-25 14:43 UTCEG score recompute
  37. 2026-08-25 13:49 UTCEPSS rescore
  38. 2026-08-24 15:19 UTCEG score recompute
  39. 2026-08-23 15:54 UTCEG score recompute
  40. 2026-08-23 00:19 UTCEPSS rescore
  41. 2026-08-22 16:30 UTCEG score recompute
  42. 2026-08-21 23:49 UTCEPSS rescore
  43. 2026-08-21 17:04 UTCEG score recompute
  44. 2026-08-20 22:55 UTCEPSS rescore
  45. 2026-08-19 18:15 UTCEG score recompute
  46. 2026-08-19 17:04 UTCEPSS rescore
  47. 2026-08-18 18:23 UTCEG score recompute
  48. 2026-08-18 17:40 UTCEG score recompute
  49. 2026-08-18 17:21 UTCEG score recompute
  50. 2026-08-18 16:35 UTCEG score recompute
  51. 2026-08-18 16:34 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-63336?
CVE-2026-63336 is a medium vulnerability published on August 18, 2026. The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, com.rabbitmq.client.ConnectionFactory.useSslProtocol() and ConnectionFactory.useSslProtocol(String) configure com.rabbitmq.client.TrustEverythingTrustManager and…
When was CVE-2026-63336 disclosed?
CVE-2026-63336 was first published on August 18, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63336 actively exploited?
CVE-2026-63336 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63336?
CVE-2026-63336 has a CVSS base score of 5.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63336?
A fix for CVE-2026-63336 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63336 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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