Dashboard / CVE-2023-22795

CVE-2023-22795

HIGH
MEDIUM Priority: 0.17 BB Relevance: 75/100
Published: 2023-02-09 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

Description

A regular expression based DoS vulnerability in Action Dispatch <6.1.7.1 and <7.0.4.1 related to the If-None-Match header. A specially crafted HTTP If-None-Match header can cause the regular expression engine to enter a state of catastrophic backtracking, when on a version of Ruby below 3.2.0. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability All users running an affected release should either upgrade or use one of the workarounds immediately.

Weakness Classification (2)

Affected Software (3)

VendorProductVersion
debian debian_linux 11.0
rubyonrails rails < 6.1.7.1
rubyonrails rails 7.0.0 – 7.0.4.1

References & Advisories (3)

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

2.28%
Raw Score 0.022780
Percentile 83.1%
Date 2026-10-29

EPSS Trend

2026-10-29
0.02278
2026-10-28
0.02278

Intelligence Sources

nvd ref →

External Links