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VulnerabilityPublished

CVE-2026-41650: NaturalIntelligence fast-xml-parser · XML Injection

Affects NaturalIntelligence fast-xml-parserSource CVE Database V5

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Not known to be exploited · CVSS 6.1 Medium : upgrade to 5.7.0 when convenient.

Data as of 7 Nov 2026, 23:24 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.7.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Upgrade NaturalIntelligence fast-xml-parser to 5.7.0.

Affected software

ProductAffectedFixed in
NaturalIntelligencefast-xml-parserAffected
  • <5.7.0
Fixed in
  • 5.7.0
npmfast-xml-parserpkg:npm/fast-xml-parserOther threatsAffected
  • <5.7.0
Fixed in
  • 5.7.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade fast-xml-parser to version 5.7.0 or later, where this vulnerability has been fixed by properly escaping the problematic sequences in XML comments and CDATA sections. No other mitigations are indicated or necessary once the patch is applied.

Description

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to version 5.7.0, XMLBuilder does not escape the "-->" sequence in comment content or the "]]>" sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation. This issue has been patched in version 5.7.0.

References

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