CVE-2022-41912: Vulnerability in github.com/crewjam/saml - Signature Bypass via Multiple Assertion Elements
Summary
CVE-2022-41912: Impact The crewjam/saml go library is vulnerable to an authentication bypass when processing SAML responses containing multiple Assertion elements. Affects github.com/crewjam/saml versions < 0.4.9. Fixed in 0.4.9. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The github.com/crewjam/saml package is a Go library that provides functionality for processing SAML (Security Assertion Markup Language) responses. SAML is an XML-based standard for exchanging authentication and authorization data between parties. The package allows applications to handle SAML assertions, validate signatures, and extract relevant information. However, a vulnerability has been discovered in the library that allows for signature bypass when processing SAML responses containing multiple Assertion elements.
Vulnerability Detail
The vulnerability in github.com/crewjam/saml arises from improper authentication handling. When a SAML response contains multiple Assertion elements, the library fails to properly authenticate the assertions, leading to an authentication bypass. This means that an attacker could craft a malicious SAML response with multiple assertions and bypass the authentication process, gaining unauthorized access to the system. The impact of this vulnerability is critical, as it undermines the security of SAML-based authentication and authorization systems.
How To Fix
Latest published version: v0.5.1 as of 23 Oct 2026
go get github.com/crewjam/saml@v0.5.1Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
0.4.9
This is the first release that contains the fix.
go get github.com/crewjam/saml@v0.4.9Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is essential to update the github.com/crewjam/saml package to the fixed version to address the issue.
Conclusion
The vulnerability in github.com/crewjam/saml allows for an authentication bypass in SAML-based systems. It is crucial to update the package to version 0.4.9 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for github.com/crewjam/saml →
FAQ
The impact of this vulnerability is critical, as it allows for an authentication bypass in SAML-based systems, potentially granting unauthorized access to sensitive resources.
To fix this vulnerability, update the github.com/crewjam/saml package to version 0.4.9 or later.
No, there is no known workaround for this vulnerability. Updating the package to the fixed version is the recommended solution.
This vulnerability was reported by Felix Wilhelm from Google Project Zero.
SAML (Security Assertion Markup Language) is an XML-based standard for exchanging authentication and authorization data between parties.
References
Related vulnerabilities
Recent vulnerabilities recorded for github.com/crewjam/saml.
