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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-material-v2

A vulnerability tracked as **CVE-2026-41413** has been found in istio.io/istio. Attackers can target a specific entry point like ``ValidatingAdmissionPolicy`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: 5.0/10. What to do: upgrade istio.io/istio to **0.0.0-20260410004459-189832a289c1** or later. If unsure, ask your IT team or search "istio.io/istio CVE-2026-41413" on the vendor's site.
CVE-2026-41413 (istio.io/istio) — CWE-918 / CVSS v3 5.0 Attack vector: remote (network-reachable) / no user interaction Attack surface: `ValidatingAdmissionPolicy` / `RequestAuthentication` Patched: `0.0.0-20260410004459-189832a289c1` — apply immediately Workaround: Users can deploy a `ValidatingAdmissionPolicy` to prevent the creation of `RequestAuthentication` resources with suspicious jwksUri field values (e.g. 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
**SSRF** (CWE-918) exists in istio.io/istio. Attackers reach the vulnerable code path via ``ValidatingAdmissionPolicy`` without authentication.
📍 Affected scope
istio.io/istio — . Attack surface: `ValidatingAdmissionPolicy` / `RequestAuthentication`.
🔥 Severity
Severity: Medium (CVSS 5.0/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **0.0.0-20260410004459-189832a289c1**.
🛡️ Workaround
Workaround: Users can deploy a `ValidatingAdmissionPolicy` to prevent the creation of `RequestAuthentication` resources with suspicious jwksUri field values (e.g.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'istio.io/istio' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

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":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.0-20260410004459-189832a289c1"}]}]

References

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