CVE-2026-29013— libcoap Out-of-Bounds Read in OSCORE CBOR Unwrap Handling
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I. Basic Information for CVE-2026-29013
Vulnerability Information
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Vulnerability Title
libcoap Out-of-Bounds Read in OSCORE CBOR Unwrap Handling
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
libcoap 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcoap是obgm开源的一个轻量级应用程序协议的 C 实现。 libcoap存在安全漏洞，该漏洞源于OSCORE附录B.2 CBOR解包处理中的越界读取，可能导致通过整数环绕触发堆缓冲区溢出写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-29013
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IV. Related Vulnerabilities
Same weakness: CWE-125
- CVE-2026-8177
XML::LibXML versions through 2.0210 for Perl read out-of-bou - CVE-2026-6104
Global buffer over-read in mb_convert_encoding() with attack - CVE-2026-7258
Out-of-bounds read in urldecode() on NetBSD - CVE-2026-8186
Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞
V. Comments for CVE-2026-29013
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