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2 vulnerabilities found for by libcoap

CVE-2026-29013 (GCVE-0-2026-29013)
Vulnerability from cvelistv5
Published
2026-04-17 21:11
Modified
2026-04-20 16:46
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
CWE
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 heap buffer overflow writes through integer wraparound in allocation size computation.
References
Impacted products
Vendor Product Version
libcoap libcoap Version: 0   < v4.3.5b
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CVE-2025-34468 (GCVE-0-2025-34468)
Vulnerability from cvelistv5
Published
2025-12-31 18:39
Modified
2026-03-23 15:43
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
CWE
  • CWE-121 - Stack-based Buffer Overflow
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).
References
Impacted products
Vendor Product Version
libcoap libcoap Version: 0   ≤ 4.3.5
 Create a notification for this product.
Show details on NVD website

To clipboard 

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