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CVE-2025-25293

ruby-saml vulnerable to Remote Denial of Service (DoS) with compressed SAML responses

Published: Mar 12, 2025Updated: Nov 3, 2025 Sources: CVE List NVD GHSA BDUCWE-400
NVD MITRE
7.5CVSSHIGH
EPSS Score
1.4%
Top 31.9%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

Description

ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to versions 1.12.4 and 1.18.0, ruby-saml is susceptible to remote Denial of Service (DoS) with compressed SAML responses. ruby-saml uses zlib to decompress SAML responses in case they're compressed. It is possible to bypass the message size check with a compressed assertion since the message size is checked before inflation and not after. This issue may lead to remote Denial of Service (DoS). Versions 1.12.4 and 1.18.0 fix the issue.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-400

Affected Products

omniauth samlomniauth
Library
Security Products / identity-access-mgmt
ruby-samlonelogin
SaaS
Security Products / identity-access-mgmt
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
Ruby SAMLRuby Team
Library
OSS Libraries / generic-library
Omniauth SAMLRuby Team
Library
OSS Libraries / generic-library
omniauthoss-projectSecurity Productsaka omniauth saml, omniauth, omnitauth-saml
onelogincommercialUSSecurity Productsaka onelogin saml sso, onelogin saml
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ruby teamoss-projectOSS Librariesaka ruby team, ruby-lang
and 2 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released
about.gitlab.com
https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials
github.blog
https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41f8b47be349a
github.com
and 17 more references View all →

Timeline

Published
Mar 12, 2025
Last Updated
Nov 3, 2025

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