CVE-2026-83613Public exploitNetwork attack vectorHinoki check available

Application stall via quadratic attribute deduplication

Published Sep 1, 2026 · Updated Sep 1, 2026

Inefficient attribute handling in xmldom allows remote attackers to stall applications by submitting well-formed XML with many attributes. DOMHandler.startElement inserts each attribute through setAttributeNode, and NamedNodeMap.setNamedItem repeats a linear duplicate lookup for every insertion, producing quadratic comparisons. Exposure requires an application to parse attacker-influenced XML or HTML; one request can occupy a Node.js event-loop thread for seconds and concurrent requests can interrupt service.

CVSS severity8.7
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Inefficient attribute handling in xmldom allows remote attackers to stall applications by submitting well-formed XML with many attributes. DOMHandler.startElement inserts each attribute through setAttributeNode, and NamedNodeMap.setNamedItem repeats a linear duplicate lookup for every insertion, producing quadratic comparisons. Exposure requires an application to parse attacker-influenced XML or HTML; one request can occupy a Node.js event-loop thread for seconds and concurrent requests can interrupt service.

The record

CVE
CVE-2026-83613
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
xmldom
Product
xmldom
Classifications
CWE-407, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.6.0
  2. Affected versionversion=>= 0.7.0, < 0.8.15
  3. Affected versionversion=>= 0.9.0, < 0.9.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

xmldom · xmldomversion=<= 0.6.0; version=>= 0.7.0, < 0.8.15; version=>= 0.9.0, < 0.9.12

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-407Inefficient Algorithmic Complexity
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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