CVE catalog
CVE-2025-66568
The ruby-saml library implements the client side of an SAML authorization. Versions up to and including 1.12.4, are vulnerable to authentication bypass through the libxml2 canonicalization process use
- Severity
- Critical · CVSS 9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.25% · Oct 25, 2026
The ruby-saml library implements the client side of an SAML authorization. Versions up to and including 1.12.4, are vulnerable to authentication bypass through the libxml2 canonicalization process used by Nokogiri for document transformation, which allows an attacker to execute a Signature Wrapping attack. When libxml2’s canonicalization is invoked on an invalid XML input, it may return an empty string rather than a canonicalized node. ruby-saml then proceeds to compute the DigestValue over this empty string, treating it as if canonicalization succeeded. This issue is fixed in version 1.18.0.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | ruby-saml | bookworm | 1.13.0-1+deb12u1 | not affected |
| Debian | ruby-saml | bookworm-security | 1.13.0-1+deb12u1 | not affected |
| Cpe | ruby-saml | Not reported | 1.18.0 | fixed |
| Ubuntu | ruby-saml | pro | 1.15.0-1 | vulnerable |
| Ubuntu | ruby-saml | pro | 1.15.0-1ubuntu0.24.04.1 | vulnerable |
| Ubuntu | ruby-saml | pro | 1.15.0-1ubuntu0.24.04.1+esm1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | ruby-saml | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | ruby-saml | cpe | Not reported | 1.18.0 | Not reported | NVD-CVE-2025-66568 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [ruby-saml]Not affected
Details (4)
1.13.0-1+deb12u1· all · bookwormNot affected
nvd · ruby-saml · debian · bookworm
1.13.0-1+deb12u1· all · bookwormNot affected
nvd · ruby-saml · debian · bookworm
1.13.0-1+deb12u1· all · bookworm-securityNot affected
nvd · ruby-saml · debian · bookworm
1.13.0-1+deb12u1· all · bookworm-securityNot affected
nvd · ruby-saml · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2025-66568]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2025-66568]
- [https://security-tracker.debian.org/tracker/CVE-2025-66568]
- [https://wid.cert-bund.de/.well-known/csaf/white/2025/wid-sec-w-2025-2764.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]