---
id: CVE-2026-121820
title: >-
  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 …
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 …
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-409
vendor: LY Corporation
product: Armeria
affected:
  - Armeria (all versions)
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T07:46:48.261Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121820'
references:
  - url: 'https://line.github.io/security-advisory-blog/CVE-2026-121820/'
  - url: 'https://github.com/line/armeria/security/advisories/GHSA-6hgp-j5h7-33m3'
tags:
  - cve.org
ingestedAt: '2026-11-06T08:48:01.716Z'
epss: 0.004
epssPercentile: 0.34493
---

## Overview

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.

## Affected

- `Armeria (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.