EUVD-2026-69248Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable with no authentication or interaction via any XML-accepting endpoint; sole impact is high availability via event loop stall with no scope change.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \t\n\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.
Articles & Coverage 2
AnalysisAI
ReDoS in @xmldom/xmldom versions 0.7.0 through 0.8.14 allows remote unauthenticated attackers to stall the Node.js event loop by submitting a small crafted XML document containing a malformed end tag. The SAX parser in lib/sax.js uses an unanchored global regex /[ \t\n\r]+$/g to trim end-tag names; a tag with N whitespace characters followed by one non-whitespace character causes the engine to retry the match from every character position with O(N) backtracking per position, yielding O(N²) total work that blocks the single-threaded event loop. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target application must use @xmldom/xmldom at a version between 0.7.0 and 0.8.14 and must pass attacker-controlled content to DOMParser.parseFromString() under default parser options - no special non-default configuration is required on the xmldom side. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N yields a score of 8.7, representing the highest realistic risk tier for a DoS-only vulnerability: network-reachable, no authentication, no special attack requirements, no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary fix is to upgrade @xmldom/xmldom to version 0.8.15, which replaces the unanchored global regex with an anchored linear-time expression, producing byte-identical trimmed output with no behavioral change for well-formed documents. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, scan production systems to identify all applications using @xmldom/xmldom versions 0.7.0-0.8.14 and document their criticality and network exposure. …
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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