Description
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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| coredns | coredns | < 1.14.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | coredns | 1.14.2-1.1 | openSUSE-SU-2026:10297-1 |
| openSUSE Leap 16.0 | coredns | 1.14.2-bp160.1.1 | openSUSE-SU-2026:20619-1 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260317T205859-150000.1.152.1 | SUSE-SU-2026:1042-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | coredns | 1.11.4-15 | — |
| Azure Linux 2 (CBL-Mariner) | coredns | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | coredns-1.13 +1 | No fix yet | — |
| Wolfi rolling | kubernetes-dns-node-cache | 1.26.7-r9 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/coredns/coredns | < 1.14.2 | 1.14.2 | GHSA-h75p-j8xm-m278 |
Advisories 5
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- WID-SEC-2026-0627 CoreDNS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 8, 2026
- openSUSE-SU-2026:20619-1 Security update for coredns SUSE / openSUSE Security Updates · Apr 25, 2026
- SUSE-SU-2026:1042-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 26, 2026
- openSUSE-SU-2026:10297-1 coredns-1.14.2-1.1 on GA media SUSE / openSUSE Security Updates · Mar 8, 2026