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CVE-2026-41674 high CVSS 7.5

Vulnerability in @xmldom/xmldom (CVE-2026-41674)

Summary

Vulnerability in @xmldom/xmldom (CVE-2026-41674). Data can be tampered with by attackers. Exploitable via DocumentType. Mitigation: upgrade to 0.9.10 or later.

Original description

The description as published by the source.

Summary

The package serializes DocumentType node fields (internalSubset, publicId, systemId) verbatim
without any escaping or validation. When these fields are set programmatically to attacker-controlled
strings, XMLSerializer.serializeToString can produce output where the DOCTYPE declaration is
terminated early and arbitrary markup appears outside it.

Details

DOMImplementation.createDocumentType(qualifiedName, publicId, systemId, internalSubset) validates
only qualifiedName against the XML QName production. The remaining three arguments are stored
as-is with no validation.

The XMLSerializer emits DocumentType nodes as:

<!DOCTYPE name[ PUBLIC pubid][ SYSTEM sysid][ [internalSubset]]>

All fields are pushed into the output buffer verbatim — no escaping, no quoting added.

internalSubset injection: The serializer wraps internalSubset with [ and ]. A value
containing ]> closes the internal subset and the DOCTYPE declaration at the injection point.
Any content after ]> in internalSubset appears outside the DOCTYPE in the serialized output as
raw XML markup. Reported by @TharVid (GHSA-f6ww-3ggp-fr8h). Affected: @xmldom/xmldom ≥ 0.9.0
via createDocumentType API; 0.8.x only via direct property write.

publicId injection: The serializer emits publicId verbatim after PUBLIC with no
quoting added. A value containing an injected system identifier (e.g.,
"pubid" SYSTEM "evil") breaks the intended quoting context,…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-41674 has been found in @xmldom/xmldom.
Attackers can target a specific entry point like DocumentType over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.5/10.
What to do: upgrade @xmldom/xmldom to 0.9.10 or later.
If unsure, ask your IT team or search "@xmldom/xmldom CVE-2026-41674" on the vendor's site.

CVE-2026-41674 (@xmldom/xmldom) — CWE-91 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: DocumentType / internalSubset / publicId / systemId
Patched: 0.9.10 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-91) exists in @xmldom/xmldom. Attackers reach the vulnerable code path via DocumentType without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of @xmldom/xmldom. Attack surface: DocumentType / internalSubset / publicId / systemId.

🔥 Severity

Severity: High (CVSS 7.5/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 0.9.10.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@xmldom/xmldom' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r '@xmldom/xmldom' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で @xmldom/xmldom を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade @xmldom/xmldom to 0.9.10

    ステージング環境で 0.9.10 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm @xmldom/xmldom
[{"type":"SEMVER","events":[{"introduced":"0.9.0"},{"fixed":"0.9.10"}]}]
npm xmldom
[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.6.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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