A vulnerability has been identified in armeria-saml versions prior to 1.43.0, where the HTTP-Redirect binding decoder decompresses attacker-supplied S

Summary

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.

Remediation

1. Inventory every LY Corporation Armeria deployment, including staging.
2. Upgrade LY Corporation Armeria to 1.43.0.
3. Confirm the running version after the upgrade.

References

• Referencehttps://github.com/line/armeria/security/advisories/GHSA-6hgp-j5h7-33m3
• Referencehttps://line.github.io/security-advisory-blog/CVE-2026-121820/