GHSA-5wm8-gmm8-39j9
Suggest an improvement- Source
- https://github.com/advisories/GHSA-5wm8-gmm8-39j9
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-5wm8-gmm8-39j9/GHSA-5wm8-gmm8-39j9.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-5wm8-gmm8-39j9
- Aliases
-
- CVE-2026-44665
- Downstream
- Related
- Published
- 2026-05-08T16:29:10Z
- Modified
- 2026-05-14T20:48:46.153952Z
- Severity
-
- 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
- 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- fast-xml-builder allows attribute values with unwanted quotes to bypass malicious or unwanted attributes
- Details
-
Summary
When an input data has quotes in attribute values but process entities is not enabled, it breaks the attribute value into multiple attributes. This gives the room for an attacker to insert unwanted attributes to the XML/HTML.
Detail
Malicious Input
{ a: { "@_attr": '" onClick="alert(1)' } }Output
<a attr="" onClick="alert(1)"></a>Workarounds
If you're not ignoring attributes then keep processEntities flag true.
- Database specific
{ "cwe_ids": [ "CWE-611", "CWE-91" ], "nvd_published_at": "2026-05-13T16:16:59Z", "severity": "HIGH", "github_reviewed_at": "2026-05-08T16:29:10Z", "github_reviewed": true }- References
Affected packages
npm / fast-xml-builder
Package
- Name
- fast-xml-builder
- View open source insights on deps.dev
- Purl
- pkg:npm/fast-xml-builder