CVE-2026-123574 Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File Parser
High 8.7
Published
Updated
Check this codebase for CVE-2026-123574 and fix it if it is affected.
What it is: CVE-2026-123574 is a high-severity vulnerability in hickory-dns, published on 8 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-123574 in the wild and no public exploit code.
Affected packages and fixed versions:
- hickory-proto (crates.io): affected from 0.24.0; fixed in 0.26.2
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-123574/ (Markdown: https://insights.sbomify.com/CVE-2026-123574/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-123574?
CVE-2026-123574 is a high-severity vulnerability in hickory-dns, published on 8 Nov 2026.
Official description
The zone file parser in the hickory-proto crate of Hickory DNS 0.24.0 before 0.26.2 panics when a single token in a zone file is 4096 bytes or longer. Attackers who can supply untrusted zone files to an application using the parser can trigger the panic to cause a denial of service.
Weakness: CWE-20
Which versions are affected by CVE-2026-123574?
1 open source package ship an affected version, including hickory-proto.
| Package | Affected | Fixed in |
|---|---|---|
hickory-proto crates.io | From 0.24.0 | 0.26.2 |
How do I fix CVE-2026-123574?
Upgrade hickory-proto to 0.26.2 or later.
Is CVE-2026-123574 being exploited?
There is no known exploitation of CVE-2026-123574 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-123574, GHSA-29xw-595w-jfj7, GHSA-4rph-pmrw-mwpw, RUSTSEC-2026-0490, UBUNTU-CVE-2026-123574.