CVE-2026-12725Network attack vector

DNS service crash via log_query heap overwrite

Published Jun 22, 2026 · Updated Jun 22, 2026

Heap-based buffer overflow in dnsmasq on affected Red Hat platforms allows remote attackers to crash DNS service via crafted replies. The log_query() path formats unsupported DS or DNSKEY algorithm or digest identifiers into an undersized heap logging buffer and writes past its end. Exploitation requires DNSSEC validation and query logging to be enabled and attacker control of a DNS response; the bounded reported impact is a dnsmasq process crash.

CVSS severity5.9
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in dnsmasq on affected Red Hat platforms allows remote attackers to crash DNS service via crafted replies. The log_query() path formats unsupported DS or DNSKEY algorithm or digest identifiers into an undersized heap logging buffer and writes past its end. Exploitation requires DNSSEC validation and query logging to be enabled and attacker control of a DNS response; the bounded reported impact is a dnsmasq process crash.

The record

CVE
CVE-2026-12725
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

5.9Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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