fast-xml-parser up to 4.2.3 denial of service

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability was found in fast-xml-parser up to 4.2.3. It has been classified as problematic. This affects an unknown function. Performing a manipulation results in denial of service. This vulnerability is known as CVE-2023-34104. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in fast-xml-parser up to 4.2.3. It has been classified as problematic. This affects an unknown code block. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

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.

The weakness was published 06/06/2023 as GHSA-6w63-h3fj-q4vw. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-34104 since 05/25/2023. Neither technical details nor an exploit are publicly available.

Upgrading to version 4.2.4 eliminates this vulnerability. Applying the patch 39b0e050bb909e8499478657f84a3076e39ce76c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: fast-xml-parser 4.2.4
Patch: 39b0e050bb909e8499478657f84a3076e39ce76c

Timelineinfo

05/25/2023 🔍
06/06/2023 +12 days 🔍
06/06/2023 +0 days 🔍
03/09/2026 +1007 days 🔍

Sourcesinfo

Advisory: GHSA-6w63-h3fj-q4vw
Status: Confirmed

CVE: CVE-2023-34104 (🔍)
GCVE (CVE): GCVE-0-2023-34104
GCVE (VulDB): GCVE-100-230865

Entryinfo

Created: 06/06/2023 22:33
Updated: 03/09/2026 14:42
Changes: 06/06/2023 22:33 (41), 07/05/2023 08:27 (12), 03/09/2026 14:42 (26)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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