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CVE-2026-41413 medium CVSS 5.0

SSRF (Server-Side Request Forgery) in istio.io/istio (CVE-2026-41413)

Summary

SSRF in istio.io/istio (CVE-2026-41413). Risk of unauthorized operations or information disclosure. Exploitable via ``ValidatingAdmissionPolicy``. Mitigation: upgrade to `0.0.0-20260410004459-189832a289c1` or later.

AI summary snake-internal / snake-template-v1

A weakness called CVE-2026-41413 was discovered in the affected product. In plain terms, it is an SSRF flaw that lets attackers probe internal networks. Severity is Medium (CVSS 5/10). Exploitation requires specific conditions but can cause real harm if successful. What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "the product CVE-2026-41413".
CVE-2026-41413 (the affected product). Severity: Medium / CVSSv3 5. Category: CWE-918. Response plan: 1. Check the vendor advisory for affected versions and the patched release. 2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS). 3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc. 4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE. PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem
A weakness (CVE-2026-41413) in the affected product. In plain words, it is an SSRF flaw that lets attackers probe internal networks.
📍 Affected scope
Target versions of the affected product (see vendor advisory). If running in production, identify exposure immediately.
🔥 Severity
Severity: Medium (CVSS 5/10). Exploitation requires specific conditions but can cause real harm if successful.
🔧 How to fix
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-918)
🛡️ Workaround
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
🔍 Detection
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.

Response Actions (7 steps)

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

  1. 1
    Identify exposure identify 
    grep -r 'istio.io/istio' . | 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 `istio.io/istio` を grep し、稼働しているサービス・バージョンを把握する。

  2. 5
    Apply temporary workaround mitigate 
    Users can deploy a `ValidatingAdmissionPolicy` to prevent the creation of `RequestAuthentication` resources with suspicious jwksUri field values (e.g.

    パッチが適用されるまでの応急処置として、Users can deploy a `ValidatingAdmissionPolicy` to prevent the creation of `RequestAuthentication` resources with suspicious jwksUri field values (e.g. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 6
    Apply patch patch 
    Upgrade istio.io/istio to 0.0.0-20260410004459-189832a289c1

    ステージング環境で 0.0.0-20260410004459-189832a289c1 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と、Step 3 で見つけた異常検知の続報チェックを含めること。

  4. 7
    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 Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

go istio.io/istio
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20260410004459-189832a289c1"}]}]

References

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