CVE-2026-123577 Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of Service
High 8.7
Published
Updated
Check this codebase for CVE-2026-123577 and fix it if it is affected.
What it is: CVE-2026-123577 is a high-severity vulnerability in hickory-dns, published on 8 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-123577 in the wild and no public exploit code.
Affected product: hickory-dns. No package-level version data is available, so check the vendor advisory linked from the reference page.
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-2026-123577/ (Markdown: https://insights.sbomify.com/CVE-2026-123577/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-123577?
CVE-2026-123577 is a high-severity vulnerability in hickory-dns, published on 8 Nov 2026.
Official description
Hickory DNS from 0.24.0 before 0.26.2 contains a resource exhaustion vulnerability that allows remote attackers to consume server memory via unbounded DoH request bodies. Attackers can send large request bodies over HTTP/2 or HTTP/3 to a DNS over HTTP server, causing memory exhaustion and denial of service.
Weakness: CWE-770
Which versions are affected by CVE-2026-123577?
How do I fix CVE-2026-123577?
Upgrade to a fixed version.
Is CVE-2026-123577 being exploited?
There is no known exploitation of CVE-2026-123577 in the wild and no public exploit code.
Sources
Also known as AZL-113206, DEBIAN-CVE-2026-123577, GHSA-5r56-v84h-c3w5, GHSA-7x66-7p9h-vgp9, UBUNTU-CVE-2026-123577.