VulnSocial

CVE-2026-40046Patch

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Integer Overflow or Wraparound vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT. The fix for "CVE-2025-66168: MQTT control packet remaining length field is not properly validated" was only applied to 5.19.2 (and future 5.19.x) releases but was missed for all 6.0.0+ versions. This issue affects Apache ActiveMQ: from 6.0.0 before 6.2.4; Apache ActiveMQ All: from 6.0.0 before 6.2.4; Apache ActiveMQ MQTT: from 6.0.0 before 6.2.4. Users are recommended to upgrade to version 6.2.4 or a 5.19.x version starting with 5.19.2 or later (currently latest is 5.19.5), which fixes the issue.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-190

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-04-09); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-09: 1Mentions · 2026-04-10: 1Patch / Workaround · 2026-04-09: 1Technical Details · 2026-04-09: 1Technical Details · 2026-04-10: 104-0904-10
Signal classification2 categories
Patch
150.0%
Disclosure
150.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-04-091
Patch1
2026-04-101
Disclosure1
Full discourse2 posts
  • Open Source Security mailing list@oss_security
    Disclosure

    Apache ActiveMQ CVE-2026-39304: Incorrect handling of TLSv1.3 KeyUpdate can be exploited to cause DoS via OOM https://www.openwall.com/lists/oss-security/2026/04/09/17 CVE-2026-40046: Missing fix for CVE-2025-66168: MQTT control packet remaining length field is not properly validated https://www.openwall.com/lists/oss-security/2026/04/09/18

    Post summary

    The post discloses two new Apache ActiveMQ CVEs, outlining a DoS flaw with TLSv1.3 KeyUpdate and a missing patch for a previously known MQTT validation issue, but provides no PoC, exploit code, or evidence of active exploitation.

    00010508
    4.4K followersView on X
  • CVE@CVEnew
    Patch

    CVE-2026-40046 Integer Overflow or Wraparound vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT. The fix for "CVE-2025-66168: MQTT control packet remainin… https://www.cve.org/CVERecord?id=CVE-2026-40046

    Post summary

    The post announces CVE‑2026‑40046 as an integer overflow in ActiveMQ and points to a fix, but offers no proof‑of‑concept, exploit code, or evidence of active exploitation.

    00000171
    57.0K followersView on X

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