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CVE-2023-22796

HIGH
7.5
CVSS Score
Published: February 9, 2023 at 12:00 AM UTC
Updated: October 24, 2026 at 01:10 PM UTC
2 products affected across 2 vendorsActivesupportRails

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Activesupport· Activesupport Projectrubygems
95%
v < 6.1.7.17.0.0 ≤ v < 7.0.4.1
Affected range stops below 6.1.7.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.4.1, so it looks safe — our inference, not a vendor statement
Rails· Rubyonrails
90%
6.1.7.17.0.4.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

PatchVendor Advisory
Source: [email protected]
https://discuss.rubyonrails.org/t/cve-2023-22796-possible-redos-based-dos-vulnerability-in-active-supports-underscore/82116
Source: [email protected]
https://security.netapp.com/advisory/ntap-20240202-0009/
Vendor Advisory
Source: [email protected]
https://www.debian.org/security/2023/dsa-5372

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400CWE-1333

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