Out-of-bounds Read in Libcoap
CVE-2026-29013
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 wit…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (18.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Libcoap — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Patch, patch)
Frequently asked questions
- What is CVE-2026-29013?
- CVE-2026-29013 is a critical-severity vulnerability in Libcoap, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2026-04-17.
- How severe is CVE-2026-29013?
- Critical severity. CVSS v3 base score is 9.8 out of 10.