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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
7.5HIGH
NVD MITRE
EPSS Score
1.5%
Top 28.7%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

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
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Weaknesses

CWE-400

Affected Products

Ruby Team
oss-projectaka ruby-lang
Ruby SAMLLibraryLibrary
OSS Libraries / rubygems
Omniauth SAMLLibraryLibrary
OSS Libraries / rubygems
Сообщество свободного программного обеспечения
oss-projectaka fsf
Debian GNU/LinuxOn-premOS
Operating Systems / linux-distro
SAML-Toolkits
oss-projectaka ruby-saml, saml-toolkits ruby-saml
ruby-samlLibrary
OSS Libraries / generic-library
omniauth
oss-projectaka omniauth saml, omnitauth-saml
omniauth samlLibrary
Security Products / identity-access-mgmt
onelogin
commercial·USaka onelogin saml sso, onelogin saml
ruby-samlSaaS
Security Products / identity-access-mgmt
RubyGems
package-ecosystem
ruby-saml
OSS Libraries

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
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
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References

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/e76c5b36bac40aedbf1ba7ffaaf495be63328cd9
github.com
https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
github.com
and 17 more references View all →

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