eclipse-wakaama up to 2026-05-26 Registration Endpoint coap/block.c allocation of resources

Summaryinfo

A vulnerability labeled as problematic has been found in eclipse-wakaama wakaama up to 2026-05-26. Affected by this vulnerability is an unknown functionality of the file coap/block.c of the component Registration Endpoint. Such manipulation leads to allocation of resources. This vulnerability is referenced as CVE-2026-58465. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in eclipse-wakaama wakaama up to 2026-05-26 and classified as problematic. Affected by this issue is an unknown part of the file coap/block.c of the component Registration Endpoint. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

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.

The weakness was published by Kazuma Matsumoto. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-58465 since 06/30/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version snapshot or 2026-05-26 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch a83f1ca28fa090fbc03c3669fef40daf4f89cd03 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• eclipse-wakaama

Name

• wakaama

Version

• 2026-05-26

License

• open-source

Website

• Product: https://github.com/eclipse-wakaama/wakaama/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion