CVE-2026-32134

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. 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, nvd
Elevated
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.9Exploit: NoneExposed: 0

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

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In versions 0.24.10 and below, when NanoMQ handles high-concurrency reconnect traffic using a reconnect-collision payload, the broker can crash due to a NULL pointer dereference during MQTT session resumption for clean_start=0 clients. The transport's p_peer callback (tcptran_pipe_peer()) iterates cpipe->subinfol while copying session metadata from the cached old pipe to the new reconnecting pipe, without checking whether the pointer is NULL. Under a reconnect race, cpipe->subinfol can be freed and set to NULL before session restore invokes this function, resulting in a remote unauthenticated Denial-of-Service (process crash) condition. This issue has been fixed in version 0.24.11.

CVSS v3
5.9
EG Score
5.9(medium)
EPSS
32.3%
KEV
Not listed

Published

May 19, 2026

Last Modified

May 19, 2026

Advisory Details (4)

Auto-updated May 20, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

NanoMQ v0.24.10-14 Session Restore Feature: NULL Pointer Dereference Crash in `tcptran_pipe_peer` · Advisory · nanomq/nanomq · GitHub

https://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2
generic

NanoMQ v0.24.10-14 Session Restore Feature: NULL Pointer Dereference Crash in `tcptran_pipe_peer` · Issue #2241 · nanomq/nanomq · GitHub

https://github.com/nanomq/nanomq/issues/2241
generic

Release NanoMQ 0.24.11 · nanomq/nanomq · GitHub

https://github.com/nanomq/nanomq/releases/tag/0.24.11
generic

* MDF [trasnport/mqtt] add more null checker base on review · nanomq/NanoNNG@522ec62 · GitHub

https://github.com/nanomq/NanoNNG/commit/522ec62e29e60d1122f2aedaa6e702dcf089f7bb

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 44× 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. 2026-07-17 23:29 UTCOSV refresh
  2. 2026-07-16 17:03 UTCEPSS rescore
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  1. 2026-06-28 14:07 UTCEPSS rescore
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  22. 2026-06-15 17:49 UTCEPSS rescore
  23. 2026-06-14 23:18 UTCEPSS rescore
  24. 2026-06-13 23:00 UTCEPSS rescore
  25. 2026-06-12 23:12 UTCEPSS rescore
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  27. 2026-06-11 14:00 UTCEPSS rescore
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  44. 2026-05-31 22:30 UTCEPSS rescore
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  48. 2026-05-29 13:44 UTCEPSS rescore
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  50. 2026-05-28 13:44 UTCEPSS rescore
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  63. 2026-05-22 21:16 UTCEPSS rescore
  64. 2026-05-20 22:38 UTCEPSS rescore
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  66. 2026-05-20 22:37 UTCEPSS rescore
  67. 2026-05-20 11:40 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-32134?
CVE-2026-32134 is a medium vulnerability published on May 19, 2026. NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In versions 0.24.10 and below, when NanoMQ handles high-concurrency reconnect traffic using a reconnect-collision payload, the broker can crash due to a NULL pointer dereference during MQTT session resumption for cleanstart=0…
When was CVE-2026-32134 disclosed?
CVE-2026-32134 was first published in the National Vulnerability Database on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-32134 actively exploited?
CVE-2026-32134 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-32134?
CVE-2026-32134 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-32134?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-32134, 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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