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Vulnerabilities

Vulnerability · CVE-2025-61780

Rack is a modular Ruby web server interface.

Published Oct 10, 2025 · catalog updated Oct 10, 2025 · Rack is a modular

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-61780. EPSS is 0.55%. 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.

Same product and reporting

Severity
Medium5.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.55%
Remediation
Version ranges on file
Affected products
vendor rack rack 3.2, < 3.2.3

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in when running behind a proxy that supports headers (such as Nginx). Specially crafted headers could cause to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When received untrusted or headers from a client, it would interpret them as proxy configuration directives. This could cause the middleware to send a "redirect" response to the proxy, prompting it to reissue a new i

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 3.2, < 3.2.33.2, < 3.2.3

How to fix CVE-2025-61780

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-2025-61780. EPSS is 0.55%. 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 3.2, < 3.2.3 3.2, < 3.2.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.55%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Nginx security

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Oct 10, 2025 · EUVD

    Detected

    Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in when running behind a proxy that supports headers (such as Nginx). Specially crafted headers could cause to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When received un

  2. Oct 10, 2025 · EUVD

    Updated

    Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in when running behind a proxy that supports headers (such as Nginx). Specially crafted headers could cause to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When received un

Sources

  • CVE.orgVulnerability recordCVE-2025-61780

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-61780

    30-day exploitation probability 0.55%

    first.org
  • EUVDVulnerability recordEUVD-2025-33749

    Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in when running behind a proxy that supports headers (such as Nginx). Specially crafted headers could cause to miscommunicate with the

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 23, 2026
  • EUVDOct 23, 2026