CVE-2026-13002 Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap parsing
An attacker controlling a DNSSEC-signed zone can cause an infinite loop in dnsmasq, denying DNS resolution for clients.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-13002?
CVE-2026-13002 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 14 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-835
Which versions are affected by CVE-2026-13002?
It affects 2 products.
Products include Redhat Enterprise Linux, Redhat Openshift Container Platform.
How do I fix CVE-2026-13002?
No fix has been published for CVE-2026-13002 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-13002 being exploited?
There is no known exploitation of CVE-2026-13002 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- CVE-2018-14667 Red Hat JBoss RichFaces Framework Expression Language Injection
- CVE-2021-20325 Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit
- CVE-2018-25011 Memory corruption in libwebp
- CVE-2018-25014 Other in libwebp
- CVE-2014-3585 Supply chain in redhat-upgrade-tool
Sources
Also known as AZL-96617, BELL-CVE-2026-13002, DEBIAN-CVE-2026-13002, ECHO-e07c-2fba-e60c, GHSA-gf7x-hg8h-x3gf, UBUNTU-CVE-2026-13002.