CVE-2026-10652Public exploitNetwork attack vector

Memory disclosure via unchecked DNS record length

Published Jun 30, 2026 · Updated Jun 30, 2026

Out-of-bounds read in the Zephyr RTOS DNS resolver 4.3.0 through 4.4.1 allows remote attackers to disclose memory via crafted DNS replies. dns_unpack_answer() trusts the RR rdlength without ensuring that the RDATA window remains inside the datagram, after which dns_validate_record() copies out-of-bounds TXT bytes or reads SRV fields. Exploitation requires a device using the built-in resolver to accept a forged or malicious response; leaked bytes reach the application, and an invalid-memory crossing can crash the device.

CVSS severity4.8
Medium
EPSS probability0.41%
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 the Zephyr RTOS DNS resolver 4.3.0 through 4.4.1 allows remote attackers to disclose memory via crafted DNS replies. dns_unpack_answer() trusts the RR rdlength without ensuring that the RDATA window remains inside the datagram, after which dns_validate_record() copies out-of-bounds TXT bytes or reads SRV fields. Exploitation requires a device using the built-in resolver to accept a forged or malicious response; leaked bytes reach the application, and an invalid-memory crossing can crash the device.

The record

CVE
CVE-2026-10652
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 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=4.3.0 <4.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=4.3.0 <4.5.0

Published CVSS scores

7.4NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
4.8Zephyr ProjectCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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.

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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

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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