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CVE-2026-11810— NULL-pointer dereference in UpdateHub OTA agent on empty inner metadata array (remote DoS)

Quick assessment

Affected
zephyrproject zephyr
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.

zephyrproject zephyr是zephyrproject组织开源的一个面向物联网设备的实时操作系统。 zephyrproject zephyr 3.7.0版本至4.4.2之前版本存在异常处理不当漏洞，该漏洞源于UpdateHub固件更新代理的probe handler解析JSON元数据时未检查内部对象数组是否为空，可能导致空指针解引用，远程触发拒绝服务。

CVSS 7.5 · High EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 3.7.0< 4.4.2 affected
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I. Basic Information for CVE-2026-11810

Vulnerability Information
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Vulnerability Title
NULL-pointer dereference in UpdateHub OTA agent on empty inner metadata array (remote DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
The UpdateHub firmware-update agent's probe handler (z_impl_updatehub_probe() in subsys/mgmt/updatehub/updatehub.c) parses the JSON metadata returned by the update server into a fixed two-level nested-array struct. After parsing it validates only the outer array length (objects_len != 2) and then dereferences objects[1].objects[0].objects.sha256sum via strlen() without checking that the inner object array of element [1] is non-empty. The metadata is attacker-influenceable network input: the agent fetches it over CoAP from the configured UpdateHub server during its routine OTA probe. A malicious or compromised update server (or, when DTLS is disabled, a network man-in-the-middle) can return a response whose second outer object array is empty. Because the parse target is zero-initialised, the corresponding objects[1].objects[0].objects.sha256sum pointer is NULL, and the subsequent strlen() dereferences address zero. The same defect exists in both the 'any boards' and 'some boards' metadata layouts. The resulting CPU fault is fatal under Zephyr's default error handling, halting or resetting the device, so the flaw is a remotely triggerable denial of service. Impact is limited to availability; it is a read from NULL with no out-of-bounds write, memory corruption, or information disclosure. The fix rejects metadata whose inner object array is empty before any dereference, on both layouts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
zephyrproject zephyr 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一个面向物联网设备的实时操作系统。 zephyrproject zephyr 3.7.0版本至4.4.2之前版本存在异常处理不当漏洞，该漏洞源于UpdateHub固件更新代理的probe handler解析JSON元数据时未检查内部对象数组是否为空，可能导致空指针解引用，远程触发拒绝服务。
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
zephyrproject zephyr 3.7.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-11810

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III. Intelligence Information for CVE-2026-11810

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Patches & Fixes for CVE-2026-11810 (1)

Vendor Advisories for CVE-2026-11810 (1)

Same Patch Batch · zephyrproject · 2026-08-10 · 5 CVEs total

CVE-2026-8718 8.4 HIGH Out-of-bounds write in DTLS peer Connection ID getsockopt (`TLS_DTLS_PEER_CID_VALUE`) in Z
CVE-2026-11809 3.7 LOW UpdateHub probe: uninitialized-heap out-of-bounds read of network-supplied metadata
CVE-2026-11811 3.7 LOW Socket file-descriptor leak in UpdateHub OTA client start_coap_client() leading to resourc
CVE-2026-11812 2.5 LOW UpdateHub: race condition on shared context causes out-of-bounds write and DoS

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-476

V. Comments for CVE-2026-11810

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