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CVE-2026-27703— RIOT has an Out-of-Bounds Write in nanoCoAP Handler

Quick assessment

Affected
RIOT-OS RIOT
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RIOT是RIOT开源的一套应用于物联网领域的操作系统。 RIOT 2026.01及之前版本存在缓冲区错误漏洞，该漏洞源于缓冲区边界验证不足，可能导致攻击者破坏相邻堆栈位置，造成拒绝服务或执行任意代码。

CVSS 7.5 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-27703

Vulnerability Information
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Vulnerability Title
RIOT has an Out-of-Bounds Write in nanoCoAP Handler
Source: CVE Program / CVE List V5
Vulnerability Description
RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. In 2026.01 and earlier, the default handler for the well_known_core resource coap_well_known_core_default_handler writes user-provided option data and other data into a fixed size buffer without validating the buffer is large enough to contain the response. This vulnerability allows an attacker to corrupt neighboring stack location, including security-sensitive addresses like the return address, leading to denial of service or arbitrary code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
RIOT 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RIOT是RIOT开源的一套应用于物联网领域的操作系统。 RIOT 2026.01及之前版本存在缓冲区错误漏洞，该漏洞源于缓冲区边界验证不足，可能导致攻击者破坏相邻堆栈位置，造成拒绝服务或执行任意代码。
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

Vendor Product Affected Versions CPE Subscribe
RIOT-OS RIOT <= 2026.01 -

II. Public POCs for CVE-2026-27703

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III. Intelligence Information for CVE-2026-27703

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Vendor Advisories for CVE-2026-27703 (1)

IV. Related Vulnerabilities

Same product: RIOT
Same vendor: RIOT-OS
Same weakness: CWE-787

V. Comments for CVE-2026-27703

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