How severe is CVE-2024-39316?

CVE-2024-39316 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-39316 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-39316?

CVE-2024-39316 affects Rack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-39316?

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

Does CVE-2024-39316 have an EU (EUVD) identifier?

Yes. CVE-2024-39316 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2325.

When was CVE-2024-39316 published?

CVE-2024-39316 was published on 2024-07-02 and last updated on 2026-06-17.

CVE-2024-39316

CVE-2024-39316 is a medium-severity vulnerability in Rack with a CVSS 3.x base score of 6.5. 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 6.5)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-2325
Weakness: CWE-1333
Affected product: Rack
Published: 2024-07-02
Last modified: 2026-06-17

Description

Rack is a modular Ruby web server interface. Starting in version 3.1.0 and prior to version 3.1.5, Regular Expression Denial of Service (ReDoS) vulnerability exists in the `Rack::Request::Helpers` module when parsing HTTP Accept headers. This vulnerability can be exploited by an attacker sending specially crafted `Accept-Encoding` or `Accept-Language` headers, causing the server to spend excessive time processing the request and leading to a Denial of Service (DoS). The fix for CVE-2024-26146 was not applied to the main branch and thus while the issue was fixed for the Rack v3.0 release series, it was not fixed in the v3.1 release series until v3.1.5. Users of versions on the 3.1 branch should upgrade to version 3.1.5 to receive the fix.

Frequently asked questions

What is CVE-2024-39316?: Rack is a modular Ruby web server interface. Starting in version 3.1.0 and prior to version 3.1.5, Regular Expression Denial of Service (ReDoS) vulnerability exists in the `Rack::Request::Helpers` module when parsing HTTP Accept headers. This vulnerability can be exploited by an attacker sending specially crafted `Accept-Encoding` or `Accept-Language` headers, causing the server to spend excessive time processing the request and leading to a Denial of Service (DoS). The fix for CVE-2024-26146 was not applied to the main branch and thus while the issue was fixed for the Rack v3.0 release series, it was not fixed in the v3.1 release series until v3.1.5. Users of versions on the 3.1 branch should upgrade to version 3.1.5 to receive the fix.
How severe is CVE-2024-39316?: CVE-2024-39316 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-39316 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-39316?: CVE-2024-39316 affects Rack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-39316?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-39316 have an EU (EUVD) identifier?: Yes. CVE-2024-39316 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2325.
When was CVE-2024-39316 published?: CVE-2024-39316 was published on 2024-07-02 and last updated on 2026-06-17.

References

Affected products (1)

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

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