CVE-2026-121820 A vulnerability has been identified in armeria-saml versions prior to 1.43.0, where the HTTP-Redirect binding decoder decompresses attacker-
High 8.7
Published
Updated
Check this codebase for CVE-2026-121820 and fix it if it is affected.
What it is: CVE-2026-121820 is a high-severity vulnerability in LY Corporation Armeria, published on 6 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-121820 in the wild and no public exploit code.
Affected product: LY Corporation Armeria. 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-2026-121820/ (Markdown: https://insights.sbomify.com/CVE-2026-121820/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121820?
CVE-2026-121820 is a high-severity vulnerability in LY Corporation Armeria, published on 6 Nov 2026.
Official description
A vulnerability has been identified in armeria-saml versions prior to 1.43.0, where the HTTP-Redirect binding decoder decompresses attacker-supplied SAML messages without limiting the output size before signature validation, allowing an unauthenticated remote attacker to exhaust server memory and cause a denial of service.
Which versions are affected by CVE-2026-121820?
How do I fix CVE-2026-121820?
No fix has been published for CVE-2026-121820 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121820 being exploited?
There is no known exploitation of CVE-2026-121820 in the wild and no public exploit code.
Sources
Also known as GHSA-6hgp-j5h7-33m3.