GHSA-45c6-75p6-83cc
fast-xml-builder Comment Value regex can be bypassed
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | fast-xml-builder | >= 1.1.5, < 1.1.6 | 1.1.6 |
Details
As written in the advisory (Markdown source, shown as plain text).
# Summary
The fix for https://github.com/advisories/GHSA-gh4j-gqv2-49f6 in fast-xml-parser sanitizes `--` sequences in XML comment content using .replace(/--/g, '- -'). This skip the values containing three consecutive dashes (e.g., --->...), allowing an attacker to break out of an XML comment and inject arbitrary XML/HTML content.
### Impact
Any application with comment property enabled allow attacker to inject malicious or unwanted code like JS script tag in the XML/HTML output.
### Workarounds
Check for the presence of 3 consecutive dashes externally in the property value used for comment tag.
References
External links from the advisory. They lead to third-party sites.