CVE-2026-26278

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Source
https://cve.org/CVERecord?id=CVE-2026-26278
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-26278.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-26278
Aliases
Downstream
CGA (73)
CLEANSTART (8)
CLSA (4)
DEBIAN (1)
MINI (14)
openSUSE (2)
ROOT (1)
UBUNTU (1)
Related
openSUSE (2)
Published
2026-02-19T19:40:55Z
Modified
2026-10-16T02:58:40Z
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
292fb784334043214e29fa60adbb5630a36f5768
Fixed
ecb2ca118ad3d6c62f2cc90416b58da24db5d18b
Fixed
910dae5be2de2955e968558fadf6e8f74f117a77
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:naturalintelligence:fast-xml-parser:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "4.1.3"
                },
                {
                    "fixed": "5.3.6"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "range": [
                {
                    "fixed": "910dae5be2de2955e968558fadf6e8f74f117a77"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v5.3.6",
            "range": [
                {
                    "fixed": "ecb2ca118ad3d6c62f2cc90416b58da24db5d18b"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

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
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/osv-test-cve-osv-conversion/osv-output/CVE-2026-26278.json"