Out-of-bounds Read in Contiki-ng
CVE-2026-5855
Contiki-NG's LwM2M TLV parser lwm2m_tlv_read() in os/services/lwm2m/lwm2m-tlv.c ignores its caller-supplied buffer length argument and reads up to six bytes from the input buffer with no bounds check. The caller in lwm2m-engine.c iterates…
Vulnerability class: Buffer Overflow
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
- Contiki-ng — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (issue-tracking)
Frequently asked questions
- What is CVE-2026-5855?
- CVE-2026-5855 is a high-severity vulnerability in Contiki-ng, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-08-06.
- How severe is CVE-2026-5855?
- High severity. CVSS v3 base score is 7.5 out of 10.