CVE-2026-29013
Severity CVSS v4.0:
HIGH
Type:
CWE-125
Out-of-bounds Read
Publication date:
17/04/2026
Last modified:
20/04/2026
Description
libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with malformed OSCORE options or responses during OSCORE negotiation to trigger out-of-bounds reads during CBOR parsing and potentially cause heap buffer overflow writes through integer wraparound in allocation size computation.
Impact
Base Score 4.0
8.80
Severity 4.0
HIGH