CVE-2022-23514Public exploitNetwork attack vector

CPU exhaustion via backtracking SVG attribute regex

Published Dec 14, 2022 · Updated Nov 3, 2025

Regular expression DoS in flavorjones Loofah before 2.19.1 allows remote attackers to exhaust CPU during SVG sanitization. The HTML5 attribute scrubber applies a backtracking regular expression to URL values in SVG attributes instead of parsing their component values. Exploitation requires an application to pass attacker-controlled SVG attribute content to the affected sanitizer, and successful abuse hangs the processing worker through sustained CPU consumption.

CVSS severity7.5
High
EPSS probability1.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression DoS in flavorjones Loofah before 2.19.1 allows remote attackers to exhaust CPU during SVG sanitization. The HTML5 attribute scrubber applies a backtracking regular expression to URL values in SVG attributes instead of parsing their component values. Exploitation requires an application to pass attacker-controlled SVG attribute content to the affected sanitizer, and successful abuse hangs the processing worker through sustained CPU consumption.

The record

CVE
CVE-2022-23514
Published
Dec 14, 2022
Updated
Nov 3, 2025
Vendor
flavorjones
Product
Loofah
Classifications
CWE-1333, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=< 2.19.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

flavorjones · Loofahversion=< 2.19.1

Published CVSS scores

7.5GitHubCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499.004Application or System Exploitation

Public exploit references

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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