Resource exhaustion in Eclipse-Wakaama Wakaama
CVE-2026-58465
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.
EPSS: 0.006 (43.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Eclipse-wakaama Wakaama — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (release-notes)
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-58465?
- CVE-2026-58465 is a high-severity vulnerability in Eclipse-Wakaama Wakaama, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-07-02.
- How severe is CVE-2026-58465?
- High severity. CVSS v3 base score is 7.5 out of 10.