Cyber Resilience

CVE-2026-41650

Naturalintelligence Fast-Xml-Parser ≤ 5.7.0

Public PoC
Published
07 May 2026
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 6.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS Score 0.0024 15th percentile
Risk Priority 45 floored blend · peak EPSS

Summary

CVE-2026-41650 is a medium-severity aka Blind XPath Injection (CWE-91) vulnerability in Naturalintelligence Fast-Xml-Parser. Its CVSS base score is 6.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Content Injection (T1659); ranked at the 15th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

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…

more

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.

CWE(s)
CWE-91

Related Threats

MITRE ATT&CK Enterprise Techniques

T1659 Content Injection Initial Access
Adversaries may gain access and continuously communicate with victims by injecting malicious content into systems through online network traffic.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-25896Same product: Naturalintelligence Fast-Xml-Parser
CVE-2026-27942Same product: Naturalintelligence Fast-Xml-Parser
CVE-2026-33349Same product: Naturalintelligence Fast-Xml-Parser
CVE-2026-25128Same product: Naturalintelligence Fast-Xml-Parser
CVE-2024-41818Same product: Naturalintelligence Fast-Xml-Parser
CVE-2023-34104Same product: Naturalintelligence Fast-Xml-Parser
CVE-2026-33036Same product: Naturalintelligence Fast-Xml-Parser
CVE-2026-26278Same product: Naturalintelligence Fast-Xml-Parser
CVE-2025-9375Shared CWE-91
CVE-2025-54251Shared CWE-91

Affected Assets

naturalintelligence
fast-xml-parser
≤ 5.7.0

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Input validation directly stops unneutralized XML metacharacters from reaching the parser.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC directly requires input neutralization and validation that eliminates XML injection flaws.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing catches XML injection during development but does not itself implement the fix.

A.8.15 Logging partial match
finds

Logging can record injection attempts for detection but does not prevent the weakness.

A.8.16 Monitoring activities partial match
finds

Monitoring can detect exploitation but provides no preventive control over XML handling.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and output encoding that directly prevent XML injection.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for defenses against injection flaws including XML.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce attack surface but do not prescribe XML-specific controls.

References