cve.bz

CVE-2025-25291

9.3 criticalEPSS 21%

Critical (9.3). EPSS 21% chance of exploitation in the next 30 days. Fixed in ruby-saml 1.12.4, 1.18.0.

ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication bypass vulnerability was found in ruby-saml prior to versions 1.12.4 and 1.18.0 due to a parser differential. ReXML and Nokogiri parse XML differently; the parsers can generate entirely different document structures from the same XML input. That allows an attacker to be able to execute a Signature Wrapping attack. This issue may lead to authentication bypass. Versions 1.12.4 and 1.18.0 fix the issue.

Severity

CVSS 4.0

9.3 critical
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

CVSS 3.1

9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
21% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-31)
CWEs
CWE-347, CWE-436
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-4vc4-m8qh-g8jmRubyGemsruby-saml<1.12.41.12.4
GHSA-4vc4-m8qh-g8jmRubyGemsruby-saml>=1.13.0 <1.18.01.18.0

References

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