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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (59.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Eclipse-Wakaama Wakaama — versions 0
Weakness classification (CWE)
References
- github.com/eclipse-wakaama/wakaama/releases/tag/snapshots/2026-05-26 (release-notes)
- github.com/eclipse-wakaama/wakaama/pull/881 (issue-tracking)
- github.com/eclipse-wakaama/wakaama/commit/a83f1ca28fa090fbc03c3669fef40daf4f89c… (patch)
- www.vulncheck.com/advisories/eclipse-wakaama-coap-block1-handler-unbounded-memo… (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.