CVSS 4.0
2.7 lowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:UCVE-2026-27942
Low (2.7) in naturalintelligence fast-xml-parser. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in fast-xml-parser 4.5.4, 5.3.8.
fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. Prior to version 5.3.8, the application crashes with stack overflow when user use XML builder with `preserveOrder:true`. Version 5.3.8 fixes the issue. As a workaround, use XML builder with `preserveOrder:false` or check the input data before passing to builder.
Severity
CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
- CWE
- CWE-120
- Published
- Modified
- Record from
- the NVD, synced
Affected
- naturalintelligence:fast-xml-parser
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-fj3w-jwp8-x2g3 | npm | fast-xml-parser | >=5.0.0 <5.3.8 | 5.3.8 |
| GHSA-fj3w-jwp8-x2g3 | npm | fast-xml-parser | >=4.0.0-beta.0 <4.5.4 | 4.5.4 |