---
title: "CVE-2025-29774: xml-crypto Vulnerable to XML Signature Verification Bypass via Multiple SignedInfo References"
url: https://erroneo.us/security/cve/CVE-2025-29774/
description: "CVE-2025-29774 (xml-crypto (npm)): xml-crypto is an XML digital signature and encryption library for Node.js. An attacker may be able to exploit a…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-03-14
date_modified: 2025-03-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-29774"
kev: false
cvss: 9.3
epss: 0.09103
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** High exploit likelihood. EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 9.1% , percentile 95: FIRST’s model estimates a 9.1% chance of exploitation activity in the next 30 days, higher than 95% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes xml-crypto (npm) >= 4.0.0, < 6.0.1, fixed in 6.0.1 ; xml-crypto (npm) >= 3.0.0, < 3.2.1, fixed in 3.2.1 ; xml-crypto (npm) < 2.1.6, fixed in 2.1.6 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `xml-crypto` >= 4.0.0, < 6.0.1 → fixed: 6.0.1
- npm `xml-crypto` >= 3.0.0, < 3.2.1 → fixed: 3.2.1
- npm `xml-crypto` < 2.1.6 → fixed: 2.1.6

## Affected products (CVE record)

- node-saml xml-crypto: >= 4.0.0, < 6.0.1, >= 3.0.0, < 3.2.1, < 2.1.6

## Severity

- GitHub_M CVSS 4.0: 9.3 `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`
- GitHub CVSS 4.0: 9.3 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 9.10% probability of exploitation activity in the next 30 days; percentile 95.

## Sources

- [GitHub Advisory GHSA-9p8x-f768-wp2g](https://github.com/advisories/GHSA-9p8x-f768-wp2g)
- [CVE.org record CVE-2025-29774](https://www.cve.org/CVERecord?id=CVE-2025-29774)
- [NVD entry CVE-2025-29774](https://nvd.nist.gov/vuln/detail/CVE-2025-29774)
- [github.com](https://github.com/node-saml/xml-crypto/security/advisories/GHSA-9p8x-f768-wp2g)
- [github.com](https://github.com/node-saml/xml-crypto/commit/28f92218ecbb8dcbd238afa4efbbd50302aa9aed)
- [github.com](https://github.com/node-saml/xml-crypto/commit/886dc63a8b4bb5ae1db9f41c7854b171eb83aa98)
- [github.com](https://github.com/node-saml/xml-crypto/commit/8ac6118ee7978b46aa56b82cbcaa5fca58c93a07)
- [github.com](https://github.com/node-saml/xml-crypto/releases/tag/v2.1.6)
- [github.com](https://github.com/node-saml/xml-crypto/releases/tag/v3.2.1)
- [github.com](https://github.com/node-saml/xml-crypto/releases/tag/v6.0.1)
- [workos.com](https://workos.com/blog/samlstorm)

---
Source page: https://erroneo.us/security/cve/CVE-2025-29774/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt