CoreDNS Loop Detection Denial of Service Vulnerability
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 1.1%
exploitation probability
1.1%top 37% of all CVEs
observed exploitation
nono source reports it
CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a denial of service vulnerability exists in CoreDNS's loop detection plugin that allows an attacker to crash the DNS server by sending specially crafted DNS queries. The vulnerability stems from the use of a predictable pseudo-random number generator (PRNG) for generating a secret query name, combined with a fatal error handler that terminates the entire process. This issue has been patched in version 1.14.2.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
coredns · corednsReferences
https://access.redhat.com/errata/RHSA-2026:25127https://access.redhat.com/errata/RHSA-2026:36873https://access.redhat.com/errata/RHSA-2026:8151https://access.redhat.com/security/cve/CVE-2026-26018https://bugzilla.redhat.com/show_bug.cgi?id=2445242https://github.com/coredns/coredns/releases/tag/v1.14.2https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26018.json