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CVE-2026-13002— Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap parsing

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.

Simon Kelley DNSmasq是英国Simon Kelley个人开发者开源的一款提供DNS转发与DHCP服务的轻量级服务器软件。 Simon Kelley DNSmasq存在资源管理错误漏洞，该漏洞源于dnssec.c库中的流程处理问题，导致无限循环，攻击者控制DNSSEC签名区域时通过单个特制响应可挂起dnsmasq进程，从而中断所有DNS解析。

CVSS 4.4 · Medium EPSS 0.15% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

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 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-2026-13002

Vulnerability Information
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Vulnerability Title
Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap parsing
Source: CVE Program / CVE List V5
Vulnerability Description
A flow has been identified into dnssec.c library, causing an infinite loop to dnsmasq service. An attacker who controls any DNSSEC-signed zone can hang the dnsmasq process with a single crafted response, killing all DNS resolution for its clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Simon Kelley DNSmasq 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Simon Kelley DNSmasq是英国Simon Kelley个人开发者开源的一款提供DNS转发与DHCP服务的轻量级服务器软件。 Simon Kelley DNSmasq存在资源管理错误漏洞，该漏洞源于dnssec.c库中的流程处理问题，导致无限循环，攻击者控制DNSSEC签名区域时通过单个特制响应可挂起dnsmasq进程，从而中断所有DNS解析。
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-2026-13002

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III. Intelligence Information for CVE-2026-13002

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Vendor Advisories for CVE-2026-13002 (2)

Same Patch Batch · Red Hat · 2026-08-14 · 11 CVEs total

CVE-2026-58224 6.5 MEDIUM Samba: ctdb fails to do integrity checking of received packets
CVE-2026-74243 6.5 MEDIUM Quay: unauthenticated secscan notification endpoint in quay when psk is unset
CVE-2026-74244 5.9 MEDIUM Quay: stripe webhook accepts forged events without signature verification in quay
CVE-2026-74245 5.9 MEDIUM Quay: unauthenticated exported logs download in quay
CVE-2026-19617 5.5 MEDIUM Libdm: lvm2: libdm: denial of service via uncontrolled recursion in config parser
CVE-2026-74240 5.4 MEDIUM Quay: jwt claim validation bypasses in quay federated robot and sso authentication
CVE-2026-19879 5.3 MEDIUM Io.undertow/undertow: undertow: http response header integrity issue due to character trun
CVE-2026-74242 5.3 MEDIUM Quay: repository notification uuid idor in quay api
CVE-2026-74241 4.8 MEDIUM Quay: ldap referral filter injection in quay external ldap authentication
CVE-2026-74247 4.2 MEDIUM Quay: ssrf via build archive_url in quay build api

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-835

V. Comments for CVE-2026-13002

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