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CVE-2026-41675 high CVSS 7.5

Vulnerability in @xmldom/xmldom (CVE-2026-41675)

Summary

Vulnerability in @xmldom/xmldom (CVE-2026-41675). Data can be tampered with by attackers. Exploitable via data. Mitigation: upgrade to 0.9.10 or later.

Original description

The description as published by the source.

Summary

The package allows attacker-controlled processing instruction data to be serialized into XML without validating or neutralizing the PI-closing sequence ?>. As a result, an attacker can terminate the processing instruction early and inject arbitrary XML nodes into the serialized output.

Details

The issue is in the DOM construction and serialization flow for processing instruction nodes.

When createProcessingInstruction(target, data) is called, the supplied data string is stored directly on the node without validation. Later, when the document is serialized, the serializer writes PI nodes by concatenating <?, the target, a space, node.data, and ?> directly.

That behavior is unsafe because processing instructions are a syntax-sensitive context. The closing delimiter ?> terminates the PI. If attacker-controlled input contains ?>, the serializer does not preserve it as literal PI content. Instead, it emits output where the remainder of the payload is treated as live XML markup.

The same class of vulnerability was previously addressed for CDATA sections (GHSA-wh4c-j3r5-mjhp / CVE-2026-34601), where ]]> in CDATA data was handled by splitting. The serializer applies no equivalent protection to processing instruction data.

Affected code

lib/dom.js — createProcessingInstruction (lines 2240–2246):

createProcessingInstruction: function (target, data) {
    var node = new ProcessingInstruction(PDC);
    node.ownerDocument…

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-2026-41675 has been found in @xmldom/xmldom.
Attackers can target a specific entry point like data 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-2026-41675" on the vendor's site.

CVE-2026-41675 (@xmldom/xmldom) — CWE-91 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: data / node.data / createProcessingInstruction / CharacterData
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 data without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of @xmldom/xmldom. Attack surface: data / node.data / createProcessingInstruction / CharacterData.

🔥 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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