AIKIDO-2026-846274
xml_builder is vulnerable to XML Injection
21
Low Risk
This Affects:
xml_builderTL;DR
The serializer escapes raw angle brackets but leaves existing ampersand entity-like sequences such as < untouched instead of re-encoding the ampersand. Input that already contains entity sequences round-trips verbatim, so a downstream parser decodes it back into functional markup. This lets externally influenced text bypass filters that reject raw < and > and inject tags into markup-sensitive output such as HTML, SVG, or RSS feeds. The fix encodes ampersands so entity sequences are neutralized on output.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you serialize externally influenced text whose output is later parsed or rendered as markup.
Background info
xml_builder is vulnerable to XML Injection in versions 0.0.6 - 2.4.0.
How to fix this
Upgrade the xml_builder library to the patch version.
Links
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SOC 2Compliant
ISO 27001Compliant