CVE-2026-58465

Name of the Vulnerable Software and Affected Versions Eclipse Wakaama versions prior to snapshot/2026-05-26

Description An unbounded memory allocation issue exists in the CoAP Block1 handler within the coap/block.c file. Unauthenticated remote attackers can cause a denial of service by sending a sequence of Block1 PUT requests with incrementing block numbers to the registration endpoint over UDP. Because the server appends each block payload to an accumulation buffer without enforcing a maximum total size limit, it repeatedly reallocates memory, leading to server memory exhaustion.

Recommendations Update Eclipse Wakaama to snapshot/2026-05-26 or a newer version.