vulnerability / NVI-00014133 / Revision 3
xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded line terminator
GitHub lists this reviewed advisory for @xmldom/xmldom. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
0.570%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.47317. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
@xmldom/xmldom
source listed= 0.9.11
## Summary An embedded line terminator bypasses the `requireWellFormed` serializer check for element and attribute names. The check was added to fix GHSA-w2rr-34g9-rvrj and GHSA-4w3w-2rp5-g8jm; a name whose first line is well-formed slips past it and is serialized verbatim, so the characters after the line terminator break out of the start/end tag or attribute. Callers who enabled `requireWellFormed` specifically to neutralize those name-injection issues remain exposed. ## Details xmldom builds every grammar production through a shared regexp builder that compiles with the `m` flag. The anchored full-string matcher used for element and attribute names, `QName_exact = reg('^', QName, '$')`, therefore inherits `m`. When it is applied as `QName_exact.test(name)` against an already-assembled node name, the `m` flag makes `$` match at an interior line terminator, so the matcher accepts any value in which **at least one line** is a valid `QName`; the other lines are never constrained. A payload whose first line is a valid `QName`, followed by a line terminator and breakout markup, is what yields a working injection. The serializer emits the accepted name verbatim into element start/e
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-jxjr-3g7g-3944 ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- CVE-2026-83617 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 3 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.