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8.7 High

CVE-2026-83606 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module

Description

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0-beta.9 until 0.9.11, the processing-instruction production in lib/grammar.js lets the greedy S+ separator and lazy Char*? data group repeatedly repartition a long whitespace tail when the required closing ?> is absent. Both parsePI and parseProcessingInstruction apply the expression to the entire remaining source, causing quadratic backtracking during DOMParser.parseFromString() under default options and allowing a small unauthenticated XML input to stall the Node.js event loop. This issue is fixed in @xmldom/xmldom version 0.9.11.

Affected products and versions

Product Affected versions Fixed in
xmldom 0.9 0.9.0-beta.9 → < 0.9.11 0.9.11
xmldom 0.9 0.9.0-beta.9 → < 0.9.11 0.9.11

References

Timeline

  1. Published
  2. Last modified

Other CVEs of xmldom

The 23 CVEs of xmldom →
CVE-2026-83619 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module 8.7 High CVE-2026-83618 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module 8.7 High CVE-2026-83617 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module 8.7 High CVE-2026-83616 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module 8.7 High
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