PT-2026-61649 · Nanomq · Nanomq

CVE-2026-35217 · Published 2026-07-20 · Updated 2026-07-20

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Name of the Vulnerable Software and Affected Versions NanoMQ (affected versions not specified)

Description A protocol-semantics flaw exists in the MQTT v5 SUBSCRIBE handling. If a subscription entry lacks the final 1-byte Subscription Options field, the broker may accept the malformed packet and install the subscription into the internal broker state. This parsing defect can also lead to a 1-byte out-of-bounds read that crosses the heap allocation boundary, which may be detected as a heap-buffer-overflow. If the read byte is acceptable, the broker may append the malformed entry into the subinfol state, causing a packet that should be rejected to be treated as a successful subscription.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-35217

GHSA-W4XH-P384-W556

Affected Products

Nanomq

References · 4

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35217.json · Exploit
• 🔥 https://github.com/nanomq/nanomq/security/advisories/GHSA-w4xh-p384-w556 · Exploit
• https://osv.dev/vulnerability/CVE-2026-35217 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35217 · Security Note