CVE-2026-50734

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-30. 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 — 3 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: 1%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All.

An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7.

Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 2, 2026

Advisory Details (2)

Auto-updated Jun 30, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-50734: Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during wire format negotiation

http://www.openwall.com/lists/oss-security/2026/06/29/10
generic
https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0

Vendor Advisories for CVE-2026-50734(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
activemq5.16.1-1 ... 5.17.6+dfsg-2 (8 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
activemq5.17.2+dfsg-2, 5.17.2+dfsg-2+deb12u1, 5.17.6+dfsg-1, 5.17.6+dfsg-2——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
activemq5.17.6+dfsg-2——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 110× 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 182 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-50734?
CVE-2026-50734 is a high vulnerability published on June 30, 2026. Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All. An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the…
When was CVE-2026-50734 disclosed?
CVE-2026-50734 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50734 actively exploited?
CVE-2026-50734 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.1% of all scored CVEs.
What is the CVSS score of CVE-2026-50734?
CVE-2026-50734 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-50734?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50734, 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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