CVE-2026-123576 Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC Requests
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123576?
CVE-2026-123576 is a high-severity vulnerability in hickory-dns, published on 8 Nov 2026.
Official description
Hickory DNS 0.24.0 through 0.26.1 contains a memory exhaustion vulnerability that allows remote attackers to consume server resources by sending incomplete DNS-over-QUIC request bodies. Attackers can open many connections and send only large length prefixes, causing pre-allocated buffers to persist without timeout and exhausting server memory.
Weakness: CWE-770
Which versions are affected by CVE-2026-123576?
How do I fix CVE-2026-123576?
No fix has been published for CVE-2026-123576 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123576 being exploited?
There is no known exploitation of CVE-2026-123576 in the wild and no public exploit code.
Sources
Also known as AZL-113212, DEBIAN-CVE-2026-123576, GHSA-2f4m-fq7w-mrgx, GHSA-ch84-jp3r-9q25, UBUNTU-CVE-2026-123576.