CVE-2026-63335

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (41st 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
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.3Exploit: 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 5.31.0, inbound AMQP command assembly in src/main/java/com/rabbitmq/client/impl/CommandAssembler.java processes a content-bearing method and header whose remainingBodyBytes value is smaller than a following AMQP.FRAME_BODY payload. CommandAssembler.consumeBodyFrame subtracts the peer-controlled payload length before validating that it fits, drives remainingBodyBytes negative, and throws a raw UnsupportedOperationException instead of MalformedFrameException. A malicious or compromised broker peer can send this malformed sequence on an open nonzero channel to terminate frame processing and close the client connection, causing denial of service for work using that connection. This issue is fixed in version 5.31.0.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100CISA 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
Severity63% × 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
0.5%
EPSS %ILE
41st
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

5.31.0

Patch available: rabbitmq/rabbitmq-java-client v5.31.0

https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.31.0
github_commit Patch Available

commit abd6d60d4e2b (rabbitmq/rabbitmq-java-client)

Patch available: rabbitmq/rabbitmq-java-client v5.31.0 (contains commit abd6d60d4e2b)

https://github.com/rabbitmq/rabbitmq-java-client/commit/abd6d60d4e2bfc1a327dc90ab246b2e8aca1f33b
github_commit

commit 31735344d9f9 (rabbitmq/rabbitmq-java-client)

Fix landed in rabbitmq/rabbitmq-java-client commit 31735344d9f9 — awaiting tagged release

https://github.com/rabbitmq/rabbitmq-java-client/commit/31735344d9f9dfc53740b67f06e560e8846b9322
github_pr Patch Available

Implement a TODO in CommandAssembler (backport #1959)

Patch available: rabbitmq/rabbitmq-java-client v5.31.0 (PR #1960 merged 2026-05-25)

https://github.com/rabbitmq/rabbitmq-java-client/pull/1960
github_pr

Implement a TODO in CommandAssembler

Fix merged in rabbitmq/rabbitmq-java-client PR #1959 on 2026-05-25 — awaiting tagged release

https://github.com/rabbitmq/rabbitmq-java-client/pull/1959
github Patch Available🟡 PoC Available

RabbitMQ Java client malformed body frame triggers raw command assembler exception · Advisory · rabbitmq/rabbitmq-java-client · GitHub

https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-qx7j-jv8m-fppr

Vendor Advisories for CVE-2026-63335(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 (148 versions)
  • every version up to 5.31.0: fixed in 5.31.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× 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 15:09 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-10-01 10:58 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-30 09:48 UTCEG score recompute
  10. 2026-09-28 13:51 UTCEPSS rescore
  11. 2026-09-28 09:06 UTCEG score recompute
  12. 2026-09-27 07:56 UTCEG score recompute
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-24 16:05 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescore
  16. 2026-09-23 13:11 UTCEG score recompute
  17. 2026-09-22 12:01 UTCEG score recompute
  18. 2026-09-21 10:50 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 09:40 UTCEG score recompute
  21. 2026-09-19 06:04 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescore
  23. 2026-09-18 04:53 UTCEG score recompute
  24. 2026-09-17 03:43 UTCEG score recompute
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 50 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-16 02:31 UTCEG score recompute
  3. 2026-09-14 00:11 UTCEG score recompute
  4. 2026-09-12 22:58 UTCEG score recompute
  5. 2026-09-11 21:48 UTCEG score recompute
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 09:37 UTCEPSS rescore
  8. 2026-09-10 20:38 UTCEG score recompute
  9. 2026-09-09 03:25 UTCEG score recompute
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-07 17:57 UTCEG score recompute
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 16:47 UTCEG score recompute
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-05 15:37 UTCEG score recompute
  16. 2026-09-05 15:31 UTCEPSS rescore
  17. 2026-09-04 14:21 UTCEG score recompute
  18. 2026-09-04 05:07 UTCEPSS rescore
  19. 2026-09-03 13:09 UTCEG score recompute
  20. 2026-09-02 14:12 UTCEPSS rescore
  21. 2026-09-02 11:46 UTCEG score recompute
  22. 2026-09-01 13:54 UTCEPSS rescore
  23. 2026-09-01 10:19 UTCEG score recompute
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-31 09:09 UTCEG score recompute
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 07:23 UTCEG score recompute
  28. 2026-08-30 01:22 UTCEPSS rescore
  29. 2026-08-29 06:09 UTCEG score recompute
  30. 2026-08-28 21:42 UTCEPSS rescore
  31. 2026-08-28 04:55 UTCEG score recompute
  32. 2026-08-27 14:25 UTCEPSS rescore
  33. 2026-08-27 03:45 UTCEG score recompute
  34. 2026-08-26 14:46 UTCEPSS rescore
  35. 2026-08-26 02:35 UTCEG score recompute
  36. 2026-08-25 13:49 UTCEPSS rescore
  37. 2026-08-25 01:24 UTCEG score recompute
  38. 2026-08-24 00:13 UTCEG score recompute
  39. 2026-08-23 00:19 UTCEPSS rescore
  40. 2026-08-22 23:04 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescore
  42. 2026-08-21 21:54 UTCEG score recompute
  43. 2026-08-20 22:55 UTCEPSS rescore
  44. 2026-08-19 19:34 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-18 18:24 UTCEG score recompute
  47. 2026-08-18 17:57 UTCEG score recompute
  48. 2026-08-18 17:21 UTCEG score recompute
  49. 2026-08-18 16:35 UTCEG score recompute
  50. 2026-08-18 16:34 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-63335?
CVE-2026-63335 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 5.31.0, inbound AMQP command assembly in src/main/java/com/rabbitmq/client/impl/CommandAssembler.java processes a content-bearing method and header whose…
When was CVE-2026-63335 disclosed?
CVE-2026-63335 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-2026-63335 actively exploited?
CVE-2026-63335 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63335?
CVE-2026-63335 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63335?
A fix for CVE-2026-63335 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63335 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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