CVE-2026-58465
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk60th percentile - higher than 60% of all known CVEs
Summary
Eclipse Wakaama before snapshot/2026-05-26 has an unbounded memory allocation vulnerability in the CoAP Block1 handler in coap/block.c. An unauthenticated remote attacker can send a sequence of Block1 PUT requests with incrementing block numbers, causing repeated reallocation of an accumulation buffer without a maximum size limit, leading to server memory exhaustion and denial of service.
Risk Assessment
The organization is at risk of a DoS attack that can crash the LwM2M server, preventing IoT device management and potentially disrupting critical services.
Recommendation
Immediately update Eclipse Wakaama to snapshot/2026-05-26 or later, which includes a fix limiting the accumulation buffer size in the CoAP block handling.
Related vulnerabilities
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Original NVD description (English source)
Eclipse Wakaama before snapshot/2026-05-26 contains an unbounded memory allocation vulnerability in the CoAP Block1 handler within coap/block.c that allows unauthenticated remote attackers to exhaust server memory by sending a sequence of Block1 PUT requests with incrementing block numbers. Attackers can target the registration endpoint over UDP without authentication, causing the server to repeatedly reallocate a growing accumulation buffer by appending each block payload without enforcing any maximum total size limit, resulting in denial of service through memory exhaustion.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

