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bdu:2026-14133

fkie_cve-2026-83605

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.

GHSA-4w3w-2rp5-g8jm — xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed

Affected: npm: @xmldom/xmldom, npm: xmldom

## Summary

`Element.setAttribute()` in `@xmldom/xmldom` bypasses attribute name validation by calling the private `_createAttribute(name)` method, which performs no validation. The public `createAttribute()` method correctly validates names against an anchored `QName` pattern, but `setAttribute()` never uses it. The serializer escapes attribute *values* but trusts attribute *names*, allowing an attacker to inject additional attributes (including event handlers) into serialized output. The `requireWellFormed: true` option did not catch this.

## Details

`Element.setAttribute(name, value)` creates attribute nodes by calling the private `_createAttribute(name)` method, which performs no validation on the `name` parameter. In contrast, the public `Document.createAttribute(name)` method validates the name against the `QName` production before creating the attribute node.

The result is a two-tier validation system where the most commonly used API (`setAttribute`) takes the unvalidated path:

- `doc.createAttribute("bad name")` — throws `INVALID_CHARACTER_ERR` (correct). - `el.setAttribute("bad name", "value")` — succeeds silently (vulnerable).

The serializer emits attribute names verbatim into the output. Because attribute values ARE escaped (quotes, ampersands, etc.), the injection must occur through the name. An attacker can terminate the current attribute and inject new ones by including quote and space characters in the attribute name.

### Root Cause

1. `setAttribute()`…

msrc_CVE-2026-83605 — xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed

msrc_CVE-2026-83605

RHSA-2026:69248 — Red Hat Security Advisory: Red Hat Developer Hub 1.9.9 release.

undici: undici: Denial of Service via unrequested WebSocket subprotocol encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal ip-address: ip-address: Server-Side Request Forgery via IPv4-mapped/NAT64 IPv6 address misclassification urllib: urllib: Credential leakage via cross-origin redirects net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service html/template: golang: Go html/template: Cross-Site Scripting via pathological input encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages nanoid: nanoid: Denial of Service via negative size input in non-secure module functions axios: axios: Denial of Service via uncontrolled recursion in form data processing pymdown-extensions: Pymdown-extensions: Denial of Service via Regular Expression Vulnerability brace-expansion: DoS via unbounded intermediate arrays, bypassing the CVE-2026-14257 mitigation ip-address: ip-address: Inconsistent IP address parsing leads to Server-Side Request Forgery (SSRF) and trust-boundary bypass nanoid: nanoid: Predictable ID generation due to integer overflow fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding fast-uri: fast-uri: Host confusion via skipped IDN canonicalization fast-…

UBUNTU-CVE-2026-83605

Affected: Ubuntu:20.04:LTS: node-xmldom, Ubuntu:22.04:LTS: node-xmldom, Ubuntu:24.04:LTS: node-xmldom, Ubuntu:26.04:LTS: node-xmldom