CVE-2026-12725— Dnsmasq: dnsmasq: heap buffer overflow in log_query() when logging unsupported ds/dnskey replies
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
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.
dnsmasq是dnsmasq团队开源的一个轻量级DNS转发器。 dnsmasq存在缓冲区错误漏洞，该漏洞源于堆缓冲区溢出，当DNSSEC验证和查询日志同时启用时，记录包含不受支持的算法或摘要类型的DS或DNSKEY回复可能导致越过内部日志缓冲区末尾写入。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1499 · Endpoint Denial of ServiceAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
unaffected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
unaffected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
affected |
any |
affected |
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I. Basic Information for CVE-2026-12725
Vulnerability Information
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Vulnerability Title
Dnsmasq: dnsmasq: heap buffer overflow in log_query() when logging unsupported ds/dnskey replies
Source: CVE Program / CVE List V5
Vulnerability Description
A heap-based buffer overflow was found in dnsmasq. When DNSSEC validation and
query logging are both enabled, logging of DS or DNSKEY replies containing
unsupported algorithm or digest types can cause dnsmasq to write past the end
of an internal logging buffer. A remote attacker able to supply such a DNS
response may crash the dnsmasq process, resulting in denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
dnsmasq 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
dnsmasq是dnsmasq团队开源的一个轻量级DNS转发器。 dnsmasq存在缓冲区错误漏洞，该漏洞源于堆缓冲区溢出，当DNSSEC验证和查询日志同时启用时，记录包含不受支持的算法或摘要类型的DS或DNSKEY回复可能导致越过内部日志缓冲区末尾写入。
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 |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-12725
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-12725 (2)
Same Patch Batch · Red Hat · 2026-06-22 · 4 CVEs total
| CVE-2026-54099 | 8.8 HIGH | Windows-machine-config-operator: windows-machine-config-operator: wicd csr extra-organizat |
| CVE-2026-54100 | 8.3 HIGH | Windows-machine-config-operator: windows-machine-config-operator: ssh host key not verifie |
| CVE-2026-12549 | 4.8 MEDIUM | Libsoup: incomplete fix for cve-2026-2443: range suffix overflow in libsoup soupserver |
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V. Comments for CVE-2026-12725
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