CVE-2023-26104Public exploitNetwork attack vector

Unauthenticated service crash via malformed URL decoding

Published Feb 25, 2023 · Updated Mar 11, 2025

Denial of service in lite-web-server 1.2.2 and earlier allows remote attackers to crash the server via a malformed request URL. The HTTP request handler passes req.url to decodeURIComponent before its response-level error handling, so malformed percent encoding raises an uncaught URIError. Any unauthenticated client that can reach an application using the WebServer API can terminate its Node.js server process, interrupting service.

CVSS severity7.5
High
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in lite-web-server 1.2.2 and earlier allows remote attackers to crash the server via a malformed request URL. The HTTP request handler passes req.url to decodeURIComponent before its response-level error handling, so malformed percent encoding raises an uncaught URIError. Any unauthenticated client that can reach an application using the WebServer API can terminate its Node.js server process, interrupting service.

The record

CVE
CVE-2023-26104
Published
Feb 25, 2023
Updated
Mar 11, 2025
Vendor
Chasyumen
Product
lite-web-server
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chasyumen · lite-web-serverversion=0 <*

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS: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-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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