CVE-2026-123572 Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone Parser
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-123572?
CVE-2026-123572 is a high-severity vulnerability in hickory-dns, published on 8 Nov 2026.
Official description
Hickory-dns from 0.20.1 before 0.26.2 contains a denial of service vulnerability in the hickory-proto SVCB and HTTPS record presentation format parser, which panics on malformed alpn values. Attackers can supply untrusted zone files with unbalanced quotes, consecutive commas, or invalid escapes in alpn parameters to crash parsing processes.
Weakness: CWE-1286
Which versions are affected by CVE-2026-123572?
1 open source package ship an affected version, including hickory-proto.
| Package | Affected | Fixed in |
|---|---|---|
hickory-proto crates.io | From 0.20.1 | 0.26.2 |
How do I fix CVE-2026-123572?
Upgrade hickory-proto to 0.26.2 or later.
Is CVE-2026-123572 being exploited?
There is no known exploitation of CVE-2026-123572 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-123572, GHSA-hx8c-fjhc-hmf5, GHSA-j8hx-pr94-c5mv, RUSTSEC-2026-0487, UBUNTU-CVE-2026-123572.