LINE Armeria SAML up to 1.41.0 authentication replay

Summaryinfo

A vulnerability was found in LINE Armeria SAML up to 1.41.0 and classified as critical. Impacted is an unknown function. Such manipulation leads to authentication replay. This vulnerability is uniquely identified as CVE-2026-11749. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in LINE Armeria SAML up to 1.41.0 and classified as critical. Affected by this issue is an unknown code. The manipulation with an unknown input leads to a authentication replay vulnerability. Using CWE to declare the problem leads to CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability has been identified in armeria-saml prior to 1.41.1, where bearer assertions are not enforced for one-time use, allowing replay of previously consumed assertion IDs within their validity period.

The advisory is shared for download at line.github.io. This vulnerability is handled as CVE-2026-11749 since 06/09/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1040.

Upgrading to version 1.41.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-116708). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• LINE

Name

• Armeria SAML

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41.0

CPE 2.3info

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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