🛡️ CVE-2026-32934
🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-770 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-QUIC (DoQ) server can be driven into unbounded goroutine and memory growth by a remote client that opens many QUIC streams and sends only 1 byte per stream. When the worker pool is full, CoreDNS still spawns a goroutine per accepted stream to wait for a worker token. Additionally, active workers block indefinitely in io.ReadFull() with no per-stream read deadline, allowing an attacker to pin all workers by sending a single byte so the read blocks waiting for the second byte of the DoQ length prefix. This enables an unauthenticated remote attacker to cause memory exhaustion and OOM-kill. This issue has been fixed in version 1.14.3. No known workarounds exist.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-770
Public Exploit ⚠️ Yes
Source NVD
Published 2026-05-05
Updated 2026-06-15
Modified 2026-05-08
Fix URL N/A

Affected Packages

Software From version Fixed in
coredns — 1.14.3
github.com/coredns/coredns — —
unknown — —

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