Resource exhaustion in Coredns
CVE-2026-26018
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.008 · change: -0.003
Affected products
- Coredns — versions < 1.14.2
- Coredns.io Coredns
Weakness classification (CWE)
References
- github.com/coredns/coredns/security/advisories/GHSA-h75p-j8xm-m278 (Exploit, Vendor Advisory)
- github.com/coredns/coredns/releases/tag/v1.14.2 (Product, Release Notes)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-26018?
- CVE-2026-26018 is a high-severity vulnerability in Coredns, classified under CWE-337. CVSS score: 7.5/10. Published 2026-03-06.
- How severe is CVE-2026-26018?
- High severity. CVSS v3 base score is 7.5 out of 10.