https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Sun, 11 Oct 2026 04:00:11 +0000 https://vulnerability.circl.lu/vuln/cve-2026-5855 <p><strong>Affected:</strong> Contiki-NG</p> <p>Contiki-NG&#39;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 while there is at least one byte remaining, so a crafted CoAP WRITE to any LwM2M endpoint whose final TLV supplies exactly one byte triggers up to five out-of-bounds reads of heap memory adjacent to the CoAP input buffer, disclosing memory contents (including key material and peer addresses) through the parsed tlv-&gt;id, tlv-&gt;length, and tlv-&gt;value fields. Corrupted tlv_len derived from the out-of-bounds memory further corrupts the caller&#39;s parse offset. In LwM2M NoSec mode, the default for constrained devices, no authentication is required.</p> <p><strong>Affected:</strong> Contiki-NG</p> <p>Contiki-NG&#39;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 while there is at least one byte remaining, so a crafted CoAP WRITE to any LwM2M endpoint whose final TLV supplies exactly one byte triggers up to five out-of-bounds reads of heap memory adjacent to the CoAP input buffer, disclosing memory contents (including key material and peer addresses) through the parsed tlv-&gt;id, tlv-&gt;length, and tlv-&gt;value fields. Corrupted tlv_len derived from the out-of-bounds memory further corrupts the caller&#39;s parse offset. In LwM2M NoSec mode, the default for constrained devices, no authentication is required.</p> https://vulnerability.circl.lu/vuln/cve-2026-5855