CVE-2026-10672Public exploitNetwork attack vector

Memory disclosure and crash via unterminated URI

Published Jul 14, 2026 · Updated Jul 14, 2026

Out-of-bounds read in Zephyr RTOS 3.0.0 through 4.4.0 allows remote attackers to disclose memory or crash devices via a long Package URI. lwm2m_pull_context_start_transfer() copies the server-controlled URI into context.uri at a fixed length without a NUL terminator, after which strlen() reads beyond the buffer. Reachability requires LwM2M firmware pull support and control of the management server, or an on-path position when strong DTLS is absent.

CVSS severity8.2
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Zephyr RTOS 3.0.0 through 4.4.0 allows remote attackers to disclose memory or crash devices via a long Package URI. lwm2m_pull_context_start_transfer() copies the server-controlled URI into context.uri at a fixed length without a NUL terminator, after which strlen() reads beyond the buffer. Reachability requires LwM2M firmware pull support and control of the management server, or an on-path position when strong DTLS is absent.

The record

CVE
CVE-2026-10672
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.0 <4.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=3.0.0 <4.5.0

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
8.2Zephyr ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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