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CVE-2026-50149

Vulnerability in github.com/projectcontour/contour (CVE-2026-50149)

Summary

vulnerability in github.com/projectcontour/contour (CVE-2026-50149). Risk of unauthorized operations or information disclosure. Exploitable via ``HTTPProxy``. Mitigation: upgrade to `1.33.5` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-50149** has been found in github.com/projectcontour/contour. Attackers can target a specific entry point like ``HTTPProxy`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade github.com/projectcontour/contour to **1.33.5** or later. If unsure, ask your IT team or search "github.com/projectcontour/contour CVE-2026-50149" on the vendor's site.
CVE-2026-50149 (github.com/projectcontour/contour) — CWE-295 / Attack surface: `HTTPProxy` / `HTTPProxies` / `TLSIncompatibleFeatures` Patched: `1.33.5` — apply immediately Workaround: Do not enable `.spec.virtualhost.tls.enableFallbackCertificate` on `HTTPProxy` resources that also define `.spec.virtualhost.jwtProviders`. 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-295) exists in github.com/projectcontour/contour. Attackers reach the vulnerable code path via ``HTTPProxy`` without authentication.
📍 Affected scope
github.com/projectcontour/contour — . Attack surface: `HTTPProxy` / `HTTPProxies` / `TLSIncompatibleFeatures`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.33.5**.
🛡️ Workaround
Workaround: Do not enable `.spec.virtualhost.tls.enableFallbackCertificate` on `HTTPProxy` resources that also define `.spec.virtualhost.jwtProviders`.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'github.com/projectcontour/contour' .` 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 'github.com/projectcontour/contour' . | 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 `github.com/projectcontour/contour` 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
    Do not enable `.spec.virtualhost.tls.enableFallbackCertificate` on `HTTPProxy` resources that also define `.spec.virtualhost.jwtProviders`.

    パッチが適用されるまでの応急処置として、Do not enable `.spec.virtualhost.tls.enableFallbackCertificate` on `HTTPProxy` resources that also define `.spec.virtualhost.jwtProviders`. 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 github.com/projectcontour/contour to 1.33.5

    ステージング環境で 1.33.5 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 github.com/projectcontour/contour
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.33.5"}]}]

References

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