zephyrproject zephyr up to 4.4.x Firmware-Update lwm2m_pull_context.c lwm2m_parse_peerinfo uri out-of-bounds

Summaryinfo

A vulnerability categorized as critical has been discovered in zephyrproject zephyr up to 4.4.x. This issue affects the function lwm2m_parse_peerinfo of the file subsys/net/lib/lwm2m/lwm2m_pull_context.c of the component Firmware-Update. Executing a manipulation of the argument uri can lead to out-of-bounds. This vulnerability is handled as CVE-2026-10672. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in zephyrproject zephyr up to 4.4.x. This vulnerability affects the function lwm2m_parse_peerinfo of the file subsys/net/lib/lwm2m/lwm2m_pull_context.c of the component Firmware-Update. The manipulation of the argument uri with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

subsys/net/lib/lwm2m/lwm2m_pull_context.c copied the firmware-update Package URI into a fixed static buffer (context.uri, size CONFIG_LWM2M_SWMGMT_PACKAGE_URI_LEN, default 128) with memcpy(context.uri, uri, LWM2M_PACKAGE_URI_LEN), copying exactly the destination size with no length validation. The Firmware-Update object stores the server-supplied Package URI (/5/0/1) in a 255-byte buffer, so a LwM2M management server (or an on-path attacker on a session lacking strong DTLS) can WRITE a URI of 128-254 characters; only the first 128 bytes are then copied into context.uri with no NUL terminator. That buffer is subsequently consumed as a C string by http_parser_parse_url(context.uri, strlen(context.uri), ...), strlen-based CoAP URI-path/PROXY-URI option appends, and lwm2m_parse_peerinfo(), causing an out-of-bounds read of adjacent static memory. The over-read bytes are appended to outbound CoAP requests (information disclosure of adjacent device memory to the server/proxy) and can crash the device (denial of service). The vulnerable copy was introduced by the pull-context refactor (first released in v3.0.0) and is present through v4.4.0; the default-on CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_SUPPORT path is affected. The fix adds a strlen(uri) >= sizeof(context.uri) check returning -ENOMEM and switches to strcpy(), guaranteeing a bounded, NUL-terminated buffer.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-10672 since 06/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 4.5.0 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• zephyrproject

Name

• zephyr

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4

CPE 2.3info

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CPE 2.2info

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Entryinfo

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