CVE-2026-26278

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Source
https://cve.org/CVERecord?id=CVE-2026-26278
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26278.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-26278
Aliases
Downstream
Related
Published
2026-02-19T19:40:55.842Z
Modified
2026-03-03T02:56:11.055003Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)
Details

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 to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by processEntities: false option.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-776"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26278.json"
}
References

Affected packages

Git / github.com/naturalintelligence/fast-xml-parser

Affected ranges

Type
GIT
Repo
https://github.com/naturalintelligence/fast-xml-parser
Events
Introduced
2f7d138af8338aaf65c1d98902f76259c7233373
Fixed
ecb2ca118ad3d6c62f2cc90416b58da24db5d18b
Database specific 
{
    "versions": [
        {
            "introduced": "5.0.0"
        },
        {
            "fixed": "5.3.6"
        }
    ]
}
Type
GIT
Repo
https://github.com/naturalintelligence/fast-xml-parser
Events
Introduced
292fb784334043214e29fa60adbb5630a36f5768
Fixed
d4eb6b4713a8d11e6730943392419040898ecbc0
Database specific 
{
    "versions": [
        {
            "introduced": "4.1.3"
        },
        {
            "fixed": "4.5.4"
        }
    ]
}

Affected versions

v4.*
v4.1.3
v4.1.4
v4.2.0
v4.2.3
v4.2.4
v4.2.5
v4.2.6
v4.2.7
v4.3.0
v4.3.1
v4.3.2
v4.3.3
v4.3.4
v4.3.5
v4.3.6
v4.4.0
v4.4.1
v4.5.0
v4.5.1
v4.5.2
v4.5.3
v5.*
v5.0.0
v5.0.2
v5.0.4
v5.0.6
v5.0.7
v5.0.9
v5.1.0
v5.2.0
v5.2.1
v5.2.2
v5.2.3
v5.2.5
v5.3.0
v5.3.1
v5.3.2
v5.3.3
v5.3.4
v5.3.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26278.json"