CVE-2026-83615

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.1.5 through 0.6.0, appendElement in lib/sax.js uses _copy to clone the complete currentNSMap for each nested element that declares a new namespace prefix. Keeping every ancestor map live on the parse stack creates quadratic peak namespace-map storage, so a small highly compressible XML document can exhaust the process heap before application validation. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
70(Attend)
EG Risk 70/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 8, 2026

Advisory Details (7)

Auto-updated Sep 1, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

Release 0.9.12 (xmldom/xmldom)

Patch available: xmldom/xmldom 0.9.12

https://github.com/xmldom/xmldom/releases/tag/0.9.12
github_release Patch Available

Release 0.8.15 (xmldom/xmldom)

Patch available: xmldom/xmldom 0.8.15

https://github.com/xmldom/xmldom/releases/tag/0.8.15
github_commit Patch Available

commit dabffe884e86 (xmldom/xmldom)

Patch available: xmldom/xmldom 0.9.12 (contains commit dabffe884e86)

https://github.com/xmldom/xmldom/commit/dabffe884e864eeecb1f515c716f875e1bc47ec1
github_commit Patch Available

commit 954370f58c04 (xmldom/xmldom)

Patch available: xmldom/xmldom 0.8.15 (contains commit 954370f58c04)

https://github.com/xmldom/xmldom/commit/954370f58c046223faf95ba77efcbc8ce014409d
github_pr Patch Available

Backport security release 0.8.15 — parser/DOM DoS, serializer name checks, end-tag reporting

Patch available: xmldom/xmldom 0.8.15 (PR #1072 merged 2026-08-21)

https://github.com/xmldom/xmldom/pull/1072
github_pr Patch Available

Security release 0.9.12 — parser/DOM DoS, serializer name checks, multiline-anchor bypass

Patch available: xmldom/xmldom 0.9.12 (PR #1071 merged 2026-08-21)

https://github.com/xmldom/xmldom/pull/1071
github Patch Available🟡 PoC Available

Quadratic-memory consumption by xmldom · Advisory · xmldom/xmldom · GitHub

https://github.com/xmldom/xmldom/security/advisories/GHSA-965w-775f-mr7g

Vendor Advisories for CVE-2026-83615(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(5 across 4 ecosystems)
npm(2)
PackageVulnerable rangeFixed inDependents
xmldom———
@xmldom/xmldom—0.9.12—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-xmldom0.8.6-1 ... 0.9.9-1 (10 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-xmldom0.9.10-1 ... 0.9.9-1 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-xmldom0.9.10-1 ... 0.9.9-1 (7 versions)0.9.12-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 28× in last 7d / 55× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 06:22 UTCEG score recompute
  2. 2026-09-19 06:22 UTCVendor advisory
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 19:11 UTCVendor advisory
  5. 2026-09-18 07:56 UTCVendor advisory
  6. 2026-09-17 20:44 UTCEG score recompute
  7. 2026-09-17 20:44 UTCVendor advisory
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-17 08:34 UTCVendor advisory
  10. 2026-09-16 21:22 UTCEG score recompute
  11. 2026-09-16 21:22 UTCVendor advisory
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 09:06 UTCEG score recompute
  14. 2026-09-16 09:06 UTCVendor advisory
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 21:07 UTCVendor advisory
  17. 2026-09-15 09:55 UTCEG score recompute
  18. 2026-09-15 09:55 UTCVendor advisory
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-14 22:43 UTCVendor advisory
  22. 2026-09-14 11:32 UTCVendor advisory
  23. 2026-09-14 00:20 UTCEG score recompute
  24. 2026-09-14 00:20 UTCVendor advisory
  25. 2026-09-13 13:09 UTCVendor advisory
Show 30 more
  1. 2026-09-13 01:58 UTCEG score recompute
  2. 2026-09-13 01:58 UTCVendor advisory
  3. 2026-09-12 14:46 UTCVendor advisory
  4. 2026-09-12 03:34 UTCVendor advisory
  5. 2026-09-11 16:23 UTCEG score recompute
  6. 2026-09-11 16:23 UTCVendor advisory
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-10 17:59 UTCEG score recompute
  10. 2026-09-09 19:35 UTCVendor advisory
  11. 2026-09-09 08:23 UTCEG score recompute
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-08 10:02 UTCVendor advisory
  14. 2026-09-07 21:34 UTCEG score recompute
  15. 2026-09-07 21:34 UTCVendor advisory
  16. 2026-09-07 10:23 UTCVendor advisory
  17. 2026-09-06 23:08 UTCEG score recompute
  18. 2026-09-06 13:48 UTCEPSS rescore
  19. 2026-09-06 00:42 UTCEG score recompute
  20. 2026-09-05 15:31 UTCEPSS rescore
  21. 2026-09-04 15:03 UTCEG score recompute
  22. 2026-09-04 05:07 UTCEPSS rescore
  23. 2026-09-04 03:47 UTCEG score recompute
  24. 2026-09-03 16:33 UTCEG score recompute
  25. 2026-09-03 16:04 UTCEG score recompute
  26. 2026-09-03 01:20 UTCEG score recompute
  27. 2026-09-02 14:12 UTCEPSS rescore
  28. 2026-09-01 15:39 UTCEG score recompute
  29. 2026-09-01 14:56 UTCEG score recompute
  30. 2026-09-01 14:53 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-83615?
CVE-2026-83615 is a high vulnerability published on September 1, 2026. xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.1.5 through 0.6.0, appendElement in lib/sax.js uses _copy to clone the complete currentNSMap for each nested element…
When was CVE-2026-83615 disclosed?
CVE-2026-83615 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-83615 actively exploited?
CVE-2026-83615 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.2% of all scored CVEs.
What is the CVSS score of CVE-2026-83615?
CVE-2026-83615 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-83615?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-83615, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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