Public proof of conceptFix available

CVE-2024-26142

Q: Is CVE-2024-26142 actively exploited?

A proof-of-concept exploit exists for CVE-2024-26142, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2024-26142?

CVE-2024-26142 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

A public proof of concept exists; no exploitation attested.

Published2024-02-27
WeaknessCWE-1333

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Rails is a web-application framework. Starting in version 7.1.0, there is a possible ReDoS vulnerability in the Accept header parsing routines of Action Dispatch. This vulnerability is patched in 7.1.3.1. Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected.

Timeline

dates in UTC

2024-02-2716:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2024-26142?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2024-26142?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

CISA-ADP · NVD · OSV

Rails

Branch	Affected	Fixed in	Source
7.1	≥ 7.1.0, ≤ 7.1.3.1	no fix published	CISA-ADP

Ruby on Railsversion to verify

Branch	Affected	Fixed in	Source
7.1	≥ 7.1.0, < 7.1.3.1	7.1.3.1	NVD · OSV

rails

Branch	Affected	Fixed in	Source
7.1	≥ 7.1.0, < 7.1.4	7.1.4	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

discuss.rubyonrails.orgVendor Advisory
github.comPatch
github.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionpoc2024-02-28
OpenCVESSVC decisionpoc—
CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-1333read 2026-10-23
NVDweakness (CWE)CWE-1333read 2026-10-23
FIRST EPSSEPSS score1.5 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2024-02-27
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2024-26142?

Is CVE-2024-26142 actively exploited?

A proof-of-concept exploit exists for CVE-2024-26142, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2024-26142?

CVE-2024-26142 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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