fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.
Priority LOW 31CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.
Why it matters now
EPSS 0.01152 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fast-xml-parser (npm): 4.1.2
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | fast-xml-parser (npm) | before 4.1.2 | 4.1.2 | Patch available | GHSA-x3cc-x39p-42qx |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- fast-xml-parser (npm) Vendor— Affected before 4.1.2 Fixed in 4.1.2 Patch available GHSA-x3cc-x39p-42qx
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:naturalintelligence:fast_xml_parser:*:*:*:*:*:*:*:* | before 4.1.2 | Vulnerable | NaturalIntelligence |
- cpe:2.3:a:naturalintelligence:fast_xml_parser:*:*:*:*:*:*:*:* Versions before 4.1.2 Vulnerable ·NaturalIntelligence
Remediation
- Fix · GHSA-x3cc-x39p-42qx fast-xml-parser (npm) Fixed in 4.1.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-26920
- 2026-10-03 Alias added: GHSA-x3cc-x39p-42qx
References
Advisory 2
Sources
- CVE-2023-26920 · CVE Program
- CVE-2023-26920 · NVD
- FIRST EPSS
- GHSA-x3cc-x39p-42qx · GitHub Advisory Database · CC BY 4.0
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