CVE-2025-25293

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

Severity Score

7.7

*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

System

Vulnerable | Subsequent

Confidentiality

None

Integrity

None

Availability

High

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2025-02-06 CVE Reserved
2025-03-12 CVE Published
2025-03-13 EPSS Updated
2025-03-14 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (8)

URL	Tag	Source
https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released	X_refsource_misc
https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials	X_refsource_misc
https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41f8b47be349a	X_refsource_misc
https://github.com/SAML-Toolkits/ruby-saml/commit/e2da4c6dae7dc01a4d9cd221395140a67e2b3eb1	X_refsource_misc
https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4	X_refsource_misc
https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0	X_refsource_misc
https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prrq	X_refsource_confirm
https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv	X_refsource_misc

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
SAML-Toolkits Search vendor "SAML-Toolkits"		Ru Search vendor "SAML-Toolkits" for product "Ru"				< 1.12.4 Search vendor "SAML-Toolkits" for product "Ru" and version " < 1.12.4"		en		Affected
SAML-Toolkits Search vendor "SAML-Toolkits"		Ru Search vendor "SAML-Toolkits" for product "Ru"				>= 1.13.0 < 1.18.0 Search vendor "SAML-Toolkits" for product "Ru" and version " >= 1.13.0 < 1.18.0"		en		Affected