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Vulnerabilities

Vulnerability · CVE-2026-27942

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.

Published Feb 26, 2026 · catalog updated Jun 17, 2026 · fast-xml-parser allows users to

Check if you run it

No confirmed exploitation is on record for CVE-2026-27942. EPSS is 0.67%. Act only if a listed version of fast-xml-parser allows users to is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (fast-xml-parser allows users to).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low2.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.67%
Remediation
Advisory link
Affected products
cpe naturalintelligence/fast-xml-parser

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 . Version 5.3.8 fixes the issue. As a workaround, use XML builder with or check the input data before passing to builder.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe naturalintelligence/fast-xml-parserversion unspecified

How to fix CVE-2026-27942

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-27942. EPSS is 0.67%. Act only if a listed version of fast-xml-parser allows users to is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-120: Classic Buffer Overflow. EPSS 0.67%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 26, 2026 · NIST NVD

    Detected

    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 . Version 5.3.8 fixes the issue. As a workaround, use XML builder with or check the input data before passing to builder.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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 . Version 5.3.8 fixes the issue. As a workaround, use XML builder with or check the input data before passing to builder.

Sources

  • CVE.orgVulnerability recordCVE-2026-27942

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-27942

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-27942

    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 . Version 5.3.8

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.