Eclipse Wakaama CoAP Block1 Handler Unbounded Memory Allocation DoS
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| eclipse-wakaama | wakaama | before snapshot/2026-05-26 | snapshot/2026-05-26 | Patch available | CNA |
- wakaama Vendoreclipse-wakaama Affected before snapshot/2026-05-26 Fixed in snapshot/2026-05-26 Patch available CNA
Remediation
- Fix · CNA wakaama (eclipse-wakaama) Fixed in snapshot/2026-05-26
Timeline
- 2026-10-02 Threatist record created from CVE-2026-58465
- 2026-10-03 Alias added: GHSA-95xc-mgc7-g4jq
References
Patch 1
Other 2
Sources
- CVE-2026-58465 · CVE Program
- CVE-2026-58465 · NVD
- FIRST EPSS
- GHSA-95xc-mgc7-g4jq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences