How severe is CVE-2026-32135?

CVE-2026-32135 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-32135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32135?

CVE-2026-32135 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32135?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-32135 have an EU (EUVD) identifier?

Yes. CVE-2026-32135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23939.

When was CVE-2026-32135 published?

CVE-2026-32135 was published on 2026-04-20 and last updated on 2026-06-17.

CVE-2026-32135

CVE-2026-32135 is a high-severity vulnerability in Emqx Nanomq with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 7.7
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23939
Weakness: CWE-122
Affected product: Emqx Nanomq
Published: 2026-04-20
Last modified: 2026-06-17

Description

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Versions prior to 0.24.11 have a remotely triggerable heap buffer overflow in the `uri_param_parse` function of NanoMQ's REST API. The vulnerability occurs due to an off-by-one error when allocating memory for query parameter keys and values, allowing an attacker to write a null byte beyond the allocated buffer. This can be triggered via a crafted HTTP request. Version 0.24.11 patches the issue.

Frequently asked questions

What is CVE-2026-32135?: NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Versions prior to 0.24.11 have a remotely triggerable heap buffer overflow in the `uri_param_parse` function of NanoMQ's REST API. The vulnerability occurs due to an off-by-one error when allocating memory for query parameter keys and values, allowing an attacker to write a null byte beyond the allocated buffer. This can be triggered via a crafted HTTP request. Version 0.24.11 patches the issue.
How severe is CVE-2026-32135?: CVE-2026-32135 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-32135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32135?: CVE-2026-32135 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32135?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-32135 have an EU (EUVD) identifier?: Yes. CVE-2026-32135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23939.
When was CVE-2026-32135 published?: CVE-2026-32135 was published on 2026-04-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*

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