PT-2026-21298

Name of the Vulnerable Software and Affected Versions fast-xml-parser versions 4.1.3 through 5.3.5 Description fast-xml-parser has a flaw in how it handles DOCTYPE entity names during XML parsing. Specifically, a dot . within an entity name is treated as a regex wildcard during entity replacement...

CVE-2026-26278

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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible ...

UBUNTU-CVE-2026-26278

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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible ...

CVE-2026-26278 fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)

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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible ...

CVE-2026-26278

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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible ...

CVE-2026-26278

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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible ...

CVE-2026-26278 fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)

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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible ...

CVE-2026-26278 fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)

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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible ...

CVE-2026-26278

CVE-2026-26278 affects the fast-xml-parser library. In versions 4.1.3 through 5.3.5, the XML parser could be forced into unbounded entity expansion, causing a single small XML input to consume seconds/minutes of CPU time and freeze the app. The issue is resolved in version 5.3.6. A workaround is ...

fast-xml-parser 安全漏洞

fast-xml-parser is an open-source library developed by Natural Intelligence. It is used for quickly validating, parsing, and processing XML files without relying on C/C++-based libraries or callbacks. Fast-xml-parser versions 5.3.5 and earlier contain security vulnerabilities. These vulnerabiliti...

5-ifc-check-cli (=1.0.0), 7ghost (>=4.11.2 <=4.11.46) +3882 more potentially affected by CVE-2026-26278 via fast-xml-parser (>=4.1.3 <=4.5.3)

fast-xml-parser NPM version =4.1.3, =4.11.2, =0.1.1, =0.0.2, =1.0.1, =1.0.0, =0.0.1, =1.0.0, =0.0.1, =0.0.1, =0.0.3 and more Source cves: CVE-2026-26278 Source advisory: OSV:GHSA-JMR7-XGP7-CMFJ...

XML Entity Expansion

Overview fast-xml-parser is a Validate XML, Parse XML, Build XML without C/C++ based libraries Affected versions of this package are vulnerable to XML Entity Expansion in replaceEntitiesValue when handling excessive DOCTYPE input. An attacker can cause excessive resource consumption and make the...

com.codbex.atlas:codbex-atlas-application (>=2.62.0 <=2.110.0), com.codbex.gaia:codbex-gaia-application (>=2.61.0 <=2.64.0) +22 more potentially affected by CVE-2026-26278 via org.webjars.npm:fast-xml-parser (>=4.5.3 <=5.8.0)

org.webjars.npm:fast-xml-parser MAVEN version =4.5.3, =2.62.0, =2.61.0, =2.52.0, =2.52.0, =2.51.0, =2.51.0, =3.6.0, =2.50.0, =5.0.0, =5.0.0, =11.58.0, =12.2.0, =11.58.0, =11.58.0, =11.48.2, =12.1.0 and more Source cves: CVE-2026-26278 Source advisory: SNYK:JAVA-ORGWEBJARSNPM-15325721...

@activepieces/piece-amazon-s3 (>=0.5.4 <=0.5.9), @activepieces/piece-amazon-ses (>=0.0.1 <=0.1.3) +1095 more potentially affected by CVE-2026-26278 via fast-xml-parser (>=5.0.1 <=5.3.5)

fast-xml-parser NPM version =5.0.1, =0.5.4, =0.0.1, =13.1.4, =1.0.0, =1.9.12, =1.0.3, =1.1.31, =1.0.0, =1.7.16, =2.33.6, =1.4.37, =1.6.11, =1.7.1 and more Source cves: CVE-2026-26278 Source advisory: OSV:GHSA-JMR7-XGP7-CMFJ...

@activepieces/piece-amazon-s3 (>=0.5.4 <=0.5.9), @activepieces/piece-amazon-ses (>=0.0.1 <=0.1.3) +1095 more potentially affected by CVE-2026-26278 via fast-xml-parser (>=5.0.1 <=5.3.5)

fast-xml-parser NPM version =5.0.1, =0.5.4, =0.0.1, =13.1.4, =1.0.0, =1.9.12, =1.0.3, =1.1.31, =1.0.0, =1.7.16, =2.33.6, =1.4.37, =1.6.11, =1.7.1 and more Source cves: CVE-2026-26278 Source advisory: SNYK:JS-FASTXMLPARSER-15307668...

5-ifc-check-cli (=1.0.0), 7ghost (>=4.11.2 <=4.11.46) +3882 more potentially affected by CVE-2026-26278 via fast-xml-parser (>=4.1.3 <=4.5.3)

fast-xml-parser NPM version =4.1.3, =4.11.2, =0.1.1, =0.0.2, =1.0.1, =1.0.0, =0.0.1, =1.0.0, =0.0.1, =0.0.1, =0.0.3 and more Source cves: CVE-2026-26278 Source advisory: SNYK:JS-FASTXMLPARSER-15307668...

GHSA-JMR7-XGP7-CMFJ fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)

Summary The XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Details There is a check in DocTypeReader.js that trie...

poc-ghsa-37qj-frw5-hhjh

PoC: GHSA-37qj-frw5-hhjh — fast-xml-...

Denial-Of-Service (DoS)

fast-xml-parser is vulnerable to Denial-Of-Service DoS. The vulnerability is due to improper handling of out-of-range numeric XML entities, where parsing entity values beyond valid Unicode ranges triggers an uncaught RangeError, causing applications to crash when processing untrusted XML input...

Linux Distros Unpatched Vulnerability : CVE-2026-25128

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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. In versions 5.0...