CVE-2026-29013
Low
Low
Medium
High
Critical
CVSS Score
Vulnerability 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.
Severity Details
out of 10.0
Low
Weakness Type (CWE)
CWE-125
Top 25 #11
Out-of-bounds Read
- Description
- The product reads data past the end, or before the beginning, of the intended buffer.
- Typical Severity
- High
- Abstraction Level
- Base
Key Information
- Published Date
- April 17, 2026
