CVE-2026-58465
Eclipse Wakaama CoAP Block1 Handler Unbounded Memory Allocation DoS
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | eclipse-wakaama |
| Product | wakaama |
| Published | Jul 2, 2026 |
| Last Updated | Jul 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
eclipse-wakaama / wakaama
0 < snapshot/2026-05-26
References
github.com: https://github.com/eclipse-wakaama/wakaama/releases/tag/snapshots%2F2026-05-26 github.com: https://github.com/eclipse-wakaama/wakaama/pull/881 github.com: https://github.com/eclipse-wakaama/wakaama/commit/a83f1ca28fa090fbc03c3669fef40daf4f89cd03 vulncheck.com: https://www.vulncheck.com/advisories/eclipse-wakaama-coap-block1-handler-unbounded-memory-allocation-dos
Credits
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. VulnCheck