CVE-2026-83606

Описание

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.

A flaw was found in xmldom, a JavaScript XML DOM parser. This vulnerability, a Regular Expression Denial of Service (ReDoS), occurs due to inefficient processing of unterminated processing instructions in XML input. A remote, unauthenticated attacker can send a specially crafted XML input, causing quadratic backtracking and stalling the Node.js event loop. This can lead to a Denial of Service (DoS) for applications using xmldom.