CVE-2026-26018

Summary

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.

Affected Software

Weaknesses

• CWE-337: CWE-337: Predictable Seed in Pseudo-Random Number Generator (PRNG)
• CWE-770: CWE-770: Allocation of Resources Without Limits or Throttling
• CWE-400: CWE-400: Uncontrolled Resource Consumption

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

github.com/coredns/coredns: CoreDNS: Denial of Service vulnerability due to predictable pseudo-random number generation

Additional References

• https://access.redhat.com/security/cve/CVE-2026-26018
• https://bugzilla.redhat.com/show_bug.cgi?id=2445242
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26018.json
• https://access.redhat.com/errata/RHSA-2026:25127
• https://access.redhat.com/errata/RHSA-2026:8151

References

• https://github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278
• https://github.com/coredns/coredns/releases/tag/v1.14.2

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