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Vulnerabilities

Vulnerability · CVE-2025-61770

Rack is a modular Ruby web server interface.

Published Oct 7, 2025 · catalog updated Oct 7, 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-2025-61770. EPSS is 0.93%. 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
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.93%
Remediation
Version ranges on file
Affected products
vendor rack rack 3.1, < 3.1.17

Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger large transient memory spikes by including a long preamble in multipart/form-data requests. The impact scales with allowed request sizes and concurrency, potentially causing worker crashes or severe slow

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, < 3.1.173.1, < 3.1.17

How to fix CVE-2025-61770

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-2025-61770. EPSS is 0.93%. 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, < 3.1.17 3.1, < 3.1.17. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.93%. 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. Oct 7, 2025 · EUVD

    Detected

    Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger lar

  2. Oct 7, 2025 · EUVD

    Updated

    Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger lar

Sources

  • CVE.orgVulnerability recordCVE-2025-61770

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-61770

    30-day exploitation probability 0.93%

    first.org
  • EUVDVulnerability recordEUVD-2025-32057

    Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing signific

    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