NIST deprecates RSA-2048 from 2030. Find every one of them before attackers do.
💎
💎 RubyGems
Not in CISA KEV
HIGH severity

Ruby SAML allows remote Denial of Service (DoS) with compressed SAML responsesGHSA-92rq-c8cf-prrq

HIGHFix: SAML-Toolkits/ruby-saml@acac9e9

GHSA-92rq-c8cf-prrq is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in ruby-saml. A fix is available for ruby-saml — see the affected versions and patch details below.

Also known asBIT-gitlab-2025-25293CVE-2025-25293
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-92rq-c8cf-prrq.

EPSS Exploitation Probability

via FIRST.org ↗
1.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs75th percentile — riskier than 75% of all scored CVEsHighest risk
0.00%2.56%5.12%7.68%5.3%1.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
💎ruby-saml💎ruby-saml

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
💎RubyGemsruby-samlall versions1.12.4bundle update ruby-saml --conservative
💎RubyGemsruby-saml≥ 1.13.0&&< 1.18.01.18.0bundle update ruby-saml --conservative

Affected Products

2 products · 5 configurations
Application
omniauth samlomniauth
≥ 2.2.0 && < 2.2.3
range
Application
ruby-samlonelogin
≥ 1.13.0 && < 1.18.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ruby-saml, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update ruby-saml to 1.12.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-92rq-c8cf-prrq is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Summary 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. ### Impact This issue may lead to remote Denial of Service (DoS).
O3 Security · Impact-Aware SCA

Is GHSA-92rq-c8cf-prrq in your dependencies?

Find it across RubyGems, including transitive dependencies.

Scan my dependencies How O3 SCA works
Ruby SAML allows remote Denial of Service (DoS) with…