CVE-2026-12969— Dnsmasq: dnsmasq: out-of-bounds read in find_soa() due to missing extrabytes validation
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 6
| 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 | unaffected |
| Red Hat | Red Hat Enterprise Linux 9 | any | unaffected |
| Red Hat | Red Hat OpenShift Container Platform 4 | 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 |
II. Public POCs for CVE-2026-12969
| # | POC Description | Source Link | Shenlong Link |
|---|
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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: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 na |
| 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: gstreamer1-plugins-bad: global buffer overflow (oob read) in h.266 |
| 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
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Libdm: lvm2: libdm: denial of service via uncontrolled recur - CVE-2026-73584
Sblim-sfcb: sblim-sfcb: privileged file corruption and denia - CVE-2026-73583
Sblim-sfcb: unsafe deserialization in sblim-sfcb provider-ma
Same vendor: Red Hat
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Acm-search-v2-rhel9: search-v2-operator: shell-command and s - CVE-2026-70495
Search-v2-operator: search-v2-operator: cluster-wide imperso - CVE-2026-66792
Multicloud-operators-subscription: multicloud-operators-subs - CVE-2026-15218
Models-as-a-service: red hat openshift ai: maas-api and maas - CVE-2026-74247
Quay: ssrf via build archive_url in quay build api
Same weakness: CWE-125
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TIER IV Nebula 1.2.0 Heap Out-of-Bounds Read via VLP32 UDP D - CVE-2026-71980
Belledonne Communications bcg729 1.1.2 Out-of-Bounds Read vi - CVE-2026-12630
6LoWPAN IPHC uncompression out-of-bounds read on reserved de - CVE-2026-40144
Memory corruption vulnerability in Endpoint Privilege Manage - CVE-2026-19955
TrailDB TOC Validation tdb.c tdb_open out-of-bounds
V. Comments for CVE-2026-12969
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