High 7.5Published Feb 9, 2023

CVE-2023-22796A regular expression based DoS vulnerability in Active Support <6.1.7.1 and <7.0.4.1.

Updated under an hour ago (Oct 26, 2026, 1:50 PM ET)

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It affects activesupport_project activesupport. Add what you run to find out whether that includes you.

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Exploited in the last 30 days

A regular expression based DoS vulnerability in Active Support <6.1.7.1 and <7.0.4.1. A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-1333
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Oct 24, 2026
First seen by InfoSec Signals: Oct 24, 2026

Affected products

Affected products

activesupport_project activesupport activesupport_project:activesupport	before 6.1.7.1; from 7.0.0 before 7.0.4.1	NVD

References

References

https://discuss.rubyonrails.org/t/cve-2023-22796-possible-redos-based-dos-vulnerability-in-active-supports-underscore/82116	patch, vendor-advisory
https://security.netapp.com/advisory/ntap-20240202-0009/
https://www.debian.org/security/2023/dsa-5372

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.