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CVE-2026-29013 (GCVE-0-2026-29013)

Vulnerability from cvelistv5 – Published: 2026-04-17 21:11 – Updated: 2026-07-14 18:39

Title

libcoap Out-of-Bounds Read in OSCORE CBOR Unwrap Handling

Summary

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 out-of-bounds reads through integer wraparound in allocation size computation.

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-20 13:53 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck CNA

References

1 reference

URL	Tags
https://github.com/obgm/libcoap/commit/b7847c4dbb…	patch

Impacted products

1 product

Vendor	Product	Version
libcoap	libcoap	Affected: 0 , < v4.3.5b (custom) cpe:2.3:a:libcoap:libcoap::::::::

Date Public

2026-04-17 00:00

Credits

Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.

Show details on NVD website

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CVE-2025-34468 (GCVE-0-2025-34468)

Vulnerability from cvelistv5 – Published: 2025-12-31 18:39 – Updated: 2026-11-08 14:00

Title

libcoap Stack-Based Buffer Overflow in Address Resolution DoS or Potential RCE

Summary

libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N