CVE-2026-49868

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.07, _parse_reply() in sys/net/application_layer/dhcpv6/client.c omits minimum-length validation before passing IA_PD and IA_NA option bodies to sub-option parsers. A malicious or compromised DHCPv6 server can send a REPLY with an option length smaller than the required structure while MODULE_DHCPV6_CLIENT_IA_PD is enabled, causing _parse_ia_pd_option to read past the option body, size_t underflow, and unbounded out-of-bounds heap reads that can crash the device and may expose or corrupt memory. This issue is fixed in version 2026.07.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/RIOT-OS/RIOT/commit/c9830dc5f2a9bf97418de4fc7d7167d00a45df17
https://github.com/RIOT-OS/RIOT/pull/22322
https://github.com/RIOT-OS/RIOT/releases/tag/2026.07
https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-p3fx-9qcg-jmcf

Configurations

No configuration.

History

16 Oct 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-16 17:17

Updated : 2026-10-21 03:17

NVD link : CVE-2026-49868

Mitre link : CVE-2026-49868

CVE.ORG link : CVE-2026-49868

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

CWE-191

Integer Underflow (Wrap or Wraparound)

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