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CVE-2026-25896 critical CVSS 9.3

Vulnerability in Naturalintelligence (CVE-2026-25896)

Summary

Vulnerability in Naturalintelligence (CVE-2026-25896). Data can be tampered with by attackers. Mitigation: upgrade to 5.3.5 or later.

Original description

The description as published by the source.

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, ", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.

Source: NIST National Vulnerability Database NVD

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-2026-25896 has been found in Naturalintelligence.
Data can be tampered with by attackers. CVSS score: 9.3/10.
What to do: upgrade Naturalintelligence to 5.3.5 or later.
If unsure, ask your IT team or search "Naturalintelligence CVE-2026-25896" on the vendor's site.

CVE-2026-25896 (Naturalintelligence) — CWE-185 / CVSS v3 9.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 5.3.5 — 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-185) exists in Naturalintelligence.

📍 Affected scope

Check the vendor advisory for the affected versions of Naturalintelligence.

🔥 Severity

Severity: Critical (CVSS 9.3/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 5.3.5.

🛡️ 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 'Naturalintelligence' . 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 'Naturalintelligence' . | 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 Naturalintelligence 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 Naturalintelligence to 5.3.5

    ステージング環境で 5.3.5 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。

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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