How serious is CVE-2023-34104?

This vulnerability has a CVSS score of 7.5 out of 10, classified as HIGH severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2023-34104?

Yes, proof-of-concept exploit code for CVE-2023-34104 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2023-34104?

CVE-2023-34104 affects naturalintelligence fast-xml-parser. Check the full CVE details for specific version information.

How do I fix CVE-2023-34104?

To remediate CVE-2023-34104, check for security patches from naturalintelligence. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2023-34104

High

|7.5

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

An attacker can exploit this vulnerability to cause a denial of service (DoS) by sending specially crafted XML data that makes the parser hang indefinitely. This can happen if the parser is processing entity names that contain special characters, so users should upgrade to the latest version or disable certain features to protect themselves.

Technical Description

fast-xml-parser is an open source, pure javascript xml parser. fast-xml-parser allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for denial of service (DoS) attacks. By crafting an entity name that results in an intentionally bad performing regex and utilizing it in the entity replacement step of the parser, this can cause the parser to stall for an indefinite amount of time. This problem has been resolved in v4.2.4. Users are advised to upgrade. Users unable to upgrade should avoid using DOCTYPE parsing by setting the `processEntities: false` option.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactNone

Integrity ImpactNone

Availability ImpactHigh

ScopeUnchanged

Vector String

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

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$2,053($1K-$5K)

Vendor Response

Grade FPatched in 1006 days

Quick Information

Published

Jun 6, 2023

almost 3 years ago

Last Modified

Mar 9, 2026

29 days ago

Vendor

naturalintelligence

Product

fast-xml-parser

Related Vulnerabilities

CVE-2024-41818High

This vulnerability allows an attacker to cause a denial of service by sending specially crafted XML input to the fast-xml-parser, which can lead to the application becoming unresponsive. It specifically affects versions prior to 4.4.1 and requires the application to use the vulnerable currency.js component to be exploited.