# CVE-2025-29774: xml-crypto Vulnerable to XML Signature Verification Bypass via Multiple SignedInfo References

- Exploited (CISA KEV): no
- Published: 2025-03-14
- CVSS: 9.3 CRITICAL (v4.0)
- EPSS: no score
- CWE: CWE-347

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 with a valid account 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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| Vercel | Blocks by default | 2025-03-18 | 4 |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Vercel

- 2025-03-18 · new · default Block
  > We have deployed a proactive security update to the Vercel Firewall , protecting against a recently disclosed vulnerability in the xml-crypto package, dubbed SAMLStorm ( CVE-2025-29774 and CVE-2025-29775 ).
  Source: https://vercel.com/changelog/vercel-firewall-protects-against-the-samlstorm-vulnerability

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2025-29774 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2025-29774