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Vulnerabilities

Vulnerability · CVE-2025-46727

Rack is a modular Ruby web server interface.

Published May 7, 2025 · catalog updated May 8, 2025 · Rack is a modular

Check if you run it

No confirmed exploitation is on record for CVE-2025-46727. EPSS is 1.21%. Act only if a listed version of Rack is a modular is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Rack is a modular).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.21%
Remediation
Version ranges on file
Affected products
vendor rack rack 3.1, < 3.1.14

Rack is a modular Ruby web server interface. Prior to versions 2.2.14, 3.0.16, and 3.1.14, parses query strings and bodies into Ruby data structures without imposing any limit on the number of parameters, allowing attackers to send requests with extremely large numbers of parameters. The vulnerability arises because iterates over each -separated key-value pair and adds it to a Hash without enforcing an upper bound on the total number of parameters. This allows an attacker to send a single request containing hundreds of thousands (or more) of parameters, which consumes excessive memory and CPU

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor rack rack 3.1, < 3.1.143.1, < 3.1.14

How to fix CVE-2025-46727

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-46727. EPSS is 1.21%. Act only if a listed version of Rack is a modular is installed.

Which versions are affected?

Compare what you have installed with rack rack 3.1, < 3.1.14 3.1, < 3.1.14. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 7, 2025 · EUVD

    Detected

    Rack is a modular Ruby web server interface. Prior to versions 2.2.14, 3.0.16, and 3.1.14, parses query strings and bodies into Ruby data structures without imposing any limit on the number of parameters, allowing attackers to send requests with extremely large numbers of parameters. The vulnerability arises because iterates over each -separated key-value pair and adds it to a Hash without enforci

  2. May 8, 2025 · EUVD

    Updated

    Rack is a modular Ruby web server interface. Prior to versions 2.2.14, 3.0.16, and 3.1.14, parses query strings and bodies into Ruby data structures without imposing any limit on the number of parameters, allowing attackers to send requests with extremely large numbers of parameters. The vulnerability arises because iterates over each -separated key-value pair and adds it to a Hash without enforci

Sources

  • CVE.orgVulnerability recordCVE-2025-46727

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-46727

    30-day exploitation probability 1.2%

    first.org
  • EUVDVulnerability recordEUVD-2025-13948

    Rack is a modular Ruby web server interface. Prior to versions 2.2.14, 3.0.16, and 3.1.14, parses query strings and bodies into Ruby data structures without imposing any limit on the number of parameters, allowing attackers to send requests with extremely large numbers of paramet

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.