How severe is CVE-2025-49007?

CVE-2025-49007 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-49007 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-49007?

CVE-2025-49007 affects Rack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-49007?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-49007 have an EU (EUVD) identifier?

Yes. CVE-2025-49007 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16936.

When was CVE-2025-49007 published?

CVE-2025-49007 was published on 2025-06-04 and last updated on 2026-06-17.

CVE-2025-49007

CVE-2025-49007 is a medium-severity vulnerability in Rack with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1333.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.6
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16936
Weakness: CWE-1333
Affected product: Rack
Published: 2025-06-04
Last modified: 2026-06-17

Description

Rack is a modular Ruby web server interface. Starting in version 3.1.0 and prior to version 3.1.16, there is a denial of service vulnerability in the Content-Disposition parsing component of Rack. This is very similar to the previous security issue CVE-2022-44571. Carefully crafted input can cause Content-Disposition header parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is used typically used in multipart parsing. Any applications that parse multipart posts using Rack (virtually all Rails applications) are impacted. Version 3.1.16 contains a patch for the vulnerability.

Frequently asked questions

What is CVE-2025-49007?: Rack is a modular Ruby web server interface. Starting in version 3.1.0 and prior to version 3.1.16, there is a denial of service vulnerability in the Content-Disposition parsing component of Rack. This is very similar to the previous security issue CVE-2022-44571. Carefully crafted input can cause Content-Disposition header parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is used typically used in multipart parsing. Any applications that parse multipart posts using Rack (virtually all Rails applications) are impacted. Version 3.1.16 contains a patch for the vulnerability.
How severe is CVE-2025-49007?: CVE-2025-49007 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-49007 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-49007?: CVE-2025-49007 affects Rack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-49007?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-49007 have an EU (EUVD) identifier?: Yes. CVE-2025-49007 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16936.
When was CVE-2025-49007 published?: CVE-2025-49007 was published on 2025-06-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*

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