CVE-2026-41650: fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks

Q: How do I fix CVE-2026-41650?

fast-xml-parser: upgrade to 5.7.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-41650 being exploited?

CVE-2026-41650 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41650 affect?

CVE-2026-41650 affects fast-xml-parser. Severity is medium (CVSS 6.1). 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 bui

Routine

MEDIUM 6.1UPGRADE

CVE-2026-41650 is a medium-severity flaw (CVSS 6.1) affecting fast-xml-parser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-91
Published	2026-05-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: naturalintelligence

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-07 15:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

naturalintelligence fast-xml-parser UPGRADE

Affected: < 5.7.0

Fixed in: 5.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fast-xml-parser || rpm -q fast-xml-parser || fast-xml-parser --version

2. UPGRADE to 5.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fast-xml-parser

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fast-xml-parser

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41650?

fast-xml-parser: upgrade to 5.7.0. Exact commands for each OS are on this page.

Is CVE-2026-41650 being exploited?

CVE-2026-41650 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41650 affect?

CVE-2026-41650 affects fast-xml-parser. Severity is medium (CVSS 6.1). 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 bui

How urgent is CVE-2026-41650?

Priority 30/100. Public exploit reference

References

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