CVE-2026-58465 Eclipse Wakaama CoAP Block1 Handler Unbounded Memory Allocation DoS
Unauthenticated remote attackers can cause denial of service in Eclipse Wakaama by exhausting server memory via unbounded Block1 PUT requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58465?
CVE-2026-58465 is a high-severity denial of service vulnerability in eclipse-wakaama wakaama, published on 2 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-58465?
How do I fix CVE-2026-58465?
No fix has been published for CVE-2026-58465 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-58465 being exploited?
There is no known exploitation of CVE-2026-58465 in the wild and no public exploit code.
Sources
Also known as GHSA-95xc-mgc7-g4jq.