CVE-2026-83611

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 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
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.9Exploit: 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 version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as , close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

CVSS v3
6.9
EG Score
6.9(medium)
EG Risk
62(Attend)
EG Risk 62/100SSVC: 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
Severity69% × 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 7b2ec67e1750 (xmldom/xmldom)

Patch available: xmldom/xmldom 0.9.12 (contains commit 7b2ec67e1750)

https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362
github_commit Patch Available

commit 4430189660b0 (xmldom/xmldom)

Patch available: xmldom/xmldom 0.8.15 (contains commit 4430189660b0)

https://github.com/xmldom/xmldom/commit/4430189660b0d380ee9c9ee7550a1358688e8828
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

Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content · Advisory · xmldom/xmldom · GitHub

https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59

Vendor Advisories for CVE-2026-83611(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 18× in last 7d / 39× 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. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 16:17 UTCEG score recompute
  3. 2026-09-18 16:17 UTCVendor advisory
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-17 13:49 UTCEG score recompute
  6. 2026-09-17 13:49 UTCVendor advisory
  7. 2026-09-16 14:09 UTCEPSS rescore
  8. 2026-09-16 11:47 UTCEG score recompute
  9. 2026-09-16 11:47 UTCVendor advisory
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 09:46 UTCEG score recompute
  12. 2026-09-15 09:46 UTCVendor advisory
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-14 07:44 UTCEG score recompute
  16. 2026-09-14 07:44 UTCVendor advisory
  17. 2026-09-13 05:42 UTCEG score recompute
  18. 2026-09-13 05:42 UTCVendor advisory
  19. 2026-09-12 03:41 UTCEG score recompute
  20. 2026-09-12 03:41 UTCVendor advisory
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 01:39 UTCEG score recompute
  24. 2026-09-09 23:38 UTCEG score recompute
  25. 2026-09-08 22:01 UTCEPSS rescore
Show 14 more
  1. 2026-09-08 04:03 UTCEG score recompute
  2. 2026-09-08 04:03 UTCVendor advisory
  3. 2026-09-07 02:01 UTCEG score recompute
  4. 2026-09-06 13:48 UTCEPSS rescore
  5. 2026-09-05 23:58 UTCEG score recompute
  6. 2026-09-05 15:31 UTCEPSS rescore
  7. 2026-09-04 21:56 UTCEG score recompute
  8. 2026-09-04 05:07 UTCEPSS rescore
  9. 2026-09-02 17:53 UTCEG score recompute
  10. 2026-09-02 14:12 UTCEPSS rescore
  11. 2026-09-01 15:40 UTCEG score recompute
  12. 2026-09-01 15:04 UTCEG score recompute
  13. 2026-09-01 14:44 UTCEG score recompute
  14. 2026-09-01 14:43 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-83611?
CVE-2026-83611 is a medium 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 version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as </a\njunk>, close the element,…
When was CVE-2026-83611 disclosed?
CVE-2026-83611 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-2026-83611 actively exploited?
CVE-2026-83611 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 71.1% of all scored CVEs.
What is the CVSS score of CVE-2026-83611?
CVE-2026-83611 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-83611?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-83611, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-83611

Explore →

Is Your Infrastructure Affected by CVE-2026-83611?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs