CVE-2022-44572Network attack vector

Service interruption via multipart attribute regex backtracking

Published Feb 9, 2023 · Updated Aug 3, 2024

Regular expression denial of service in Rack multipart parsing allows remote attackers to interrupt applications via crafted posts. The RFC2183 Content-Disposition attribute expression accepts control characters that drive excessive backtracking while parsing multipart parameters. Any network-reachable application that parses multipart posts is exposed; a malicious request consumes excessive CPU time and delays or prevents request processing.

CVSS severity7.5
High
EPSS probability1.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in Rack multipart parsing allows remote attackers to interrupt applications via crafted posts. The RFC2183 Content-Disposition attribute expression accepts control characters that drive excessive backtracking while parsing multipart parameters. Any network-reachable application that parses multipart posts is exposed; a malicious request consumes excessive CPU time and delays or prevents request processing.

The record

CVE
CVE-2022-44572
Published
Feb 9, 2023
Updated
Aug 3, 2024
Vendor
Rack
Product
Rack
Classifications
CWE-1333, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.9.2, 2.1.4.2, 2.2.4.1, 3.0.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rack · Rackversion=2.0.9.2, 2.1.4.2, 2.2.4.1, 3.0.0.1

Published CVSS scores

7.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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