What’s Vulnerable › Vulnerabilities

CVE-2023-26920

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-12-12 · updated 2026-06-17
• Weakness: CWE-1321

Description

fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.

Affected products

• NaturalIntelligence Fast Xml Parser: before 4.1.2 — fixed in 4.1.2

How to fix

Upgrade to a fixed version: NaturalIntelligence Fast Xml Parser 4.1.2. Check the vendor advisory for mitigations.

References

• https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7
• https://github.com/NaturalIntelligence/fast-xml-parser/commit/2b032a4f799c63d83991e4f992f1c68e4dd05804
• https://github.com/advisories/GHSA-793h-6f7r-6qvm
• https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7
• https://github.com/NaturalIntelligence/fast-xml-parser/commit/2b032a4f799c63d83991e4f992f1c68e4dd05804
• https://github.com/advisories/GHSA-793h-6f7r-6qvm

Get alerted when CVE-2023-26920 or the next vulnerability affects your stack