---
title: "CVE-2025-54419: Node-SAML SAML Signature Verification Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-54419/
description: "CVE-2025-54419 (@node-saml/node-saml (npm)): A SAML library not dependent on any frameworks that runs in Node. In version 5.0.1, Node-SAML loads the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-07-28
date_modified: 2025-08-08
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-54419"
kev: false
cvss: 10
epss: 0.00365
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-54419: Node-SAML SAML Signature Verification Vulnerability

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 29: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 29% of all scored CVEs (low). 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 @node-saml/node-saml (npm) <= 5.0.1, fixed in 5.1.0 ; passport-saml (npm) <= 3.2.4, no fixed version listed ; @node-saml/passport-saml (npm) <= 5.0.1, fixed in 5.1.0 . Check your lockfile, including transitive dependencies.

## What it is

A SAML library not dependent on any frameworks that runs in Node. In version 5.0.1, Node-SAML loads the assertion from the (unsigned) original response document. This is different than the parts that are verified when checking signature. This allows an attacker to modify authentication details within a valid SAML assertion. For example, in one attack it is possible to remove any character from the SAML assertion username. To conduct the attack an attacker would need a validly signed document from the identity provider (IdP). This is fixed in version 5.1.0.

## Affected packages

- npm `@node-saml/node-saml` <= 5.0.1 → fixed: 5.1.0
- npm `passport-saml` <= 3.2.4 → fixed: none listed
- npm `@node-saml/passport-saml` <= 5.0.1 → fixed: 5.1.0

## Affected products (CVE record)

- node-saml node-saml: = 5.0.1

## Severity

- GitHub_M CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.36% probability of exploitation activity in the next 30 days; percentile 29.

## Sources

- [GitHub Advisory GHSA-4mxg-3p6v-xgq3](https://github.com/advisories/GHSA-4mxg-3p6v-xgq3)
- [CVE.org record CVE-2025-54419](https://www.cve.org/CVERecord?id=CVE-2025-54419)
- [NVD entry CVE-2025-54419](https://nvd.nist.gov/vuln/detail/CVE-2025-54419)
- [github.com](https://github.com/node-saml/node-saml/security/advisories/GHSA-4mxg-3p6v-xgq3)
- [github.com](https://github.com/node-saml/node-saml/commit/31ead9411ebc3e2385086fa9149b6c17732bca10)
- [github.com](https://github.com/node-saml/node-saml/releases/tag/v5.1.0)

---
Source page: https://erroneo.us/security/cve/CVE-2025-54419/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt