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CVE-2026-12969— Dnsmasq: dnsmasq: out-of-bounds read in find_soa() due to missing extrabytes validation

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dnsmasq的src/rfc1035.c文件中find_soa()函数存在越界读取漏洞，当解析NS section记录时，extract_name()以extrabytes=0被调用，未验证固定长度DNS记录字段是否存在额外的10字节，远程攻击者通过控制DNS区域并利用特制NXDOMAIN响应可能导致10字节堆越界读取，从而访问先前事务的陈旧数据。

CVSS 5.3 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 7

VendorProduct Version RangeStatus
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 unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
Red Hat Red Hat OpenShift Container Platform 4 any unaffected
any unaffected
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I. Basic Information for CVE-2026-12969

Vulnerability Information
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Vulnerability Title
Dnsmasq: dnsmasq: out-of-bounds read in find_soa() due to missing extrabytes validation
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c. When parsing NS section records, extract_name() is called with extrabytes=0, failing to validate that 10 additional bytes exist for fixed-length DNS record fields. A remote attacker controlling a DNS zone can exploit this via a crafted NXDOMAIN response to cause a 10-byte heap out-of-bounds read, potentially accessing stale data from prior transactions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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dnsmasq的src/rfc1035.c文件中find_soa()函数存在越界读取漏洞，当解析NS section记录时，extract_name()以extrabytes=0被调用，未验证固定长度DNS记录字段是否存在额外的10字节，远程攻击者通过控制DNS区域并利用特制NXDOMAIN响应可能导致10字节堆越界读取，从而访问先前事务的陈旧数据。
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-2026-12969

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III. Intelligence Information for CVE-2026-12969

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Vendor Advisories for CVE-2026-12969 (1)

Other References for CVE-2026-12969 (1)

Same Patch Batch · Red Hat · 2026-06-23 · 12 CVEs total

CVE-2026-11807 9.6 CRITICAL Eda-server: websocket missing authorization allows credential theft via activation_id spoo
CVE-2026-12112 7.8 HIGH Foreman-mcp-server: mcp server: active session hijacking via insecure session state reuse
CVE-2026-10609 6.8 MEDIUM Openshift/cluster-logging-operator: cluster logging operator creates and forwards servicea
CVE-2026-11820 6.5 MEDIUM Community.general: community.general nexmo — api credentials exposed in get url query stri
CVE-2026-9073 6.2 MEDIUM Foreman-mcp-server: mcp server: insecure sensitive http header sanitization
CVE-2026-11819 5.5 MEDIUM Community.general: community.general keyring_info — os keyring passphrase returned in plai
CVE-2026-55655 5.0 MEDIUM Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat ente
CVE-2026-12892 4.4 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.2
CVE-2026-55653 4.3 MEDIUM Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path du
CVE-2026-12891 4.3 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: global buffer overflow (oob read) in
CVE-2026-55654 3.7 LOW Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi in

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-12969

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