PT-2026-37094 · Coredns · Coredns
Manizada
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Published
2026-04-28
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Updated
2026-05-21
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CVE-2026-32934
CVSS v4.0
8.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
CoreDNS versions prior to 1.14.3
Description
The DNS-over-QUIC (DoQ) server can be driven into unbounded goroutine and memory growth by an unauthenticated remote attacker. This occurs when a client opens numerous QUIC streams and sends only one byte per stream. Even when the worker pool is full, the server continues to spawn a goroutine for every accepted stream to wait for a worker token. Furthermore, active workers can block indefinitely in the
io.ReadFull() function because there is no per-stream read deadline, allowing an attacker to pin all workers by sending a single byte while the system waits for the second byte of the DoQ length prefix. This sequence leads to memory exhaustion and an OOM-kill (Out-Of-Memory kill), resulting in a denial of service.Recommendations
Update to version 1.14.3.
Exploit
Fix
Allocation of Resources Without Limits
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Weakness Enumeration
Related Identifiers
Affected Products
Coredns