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CVE-2026-65600 medium CVSS 5.3

Path Traversal in github.com/traefik/traefik/v2 (CVE-2026-65600)

Summary

Path traversal in github.com/traefik/traefik/v2 (CVE-2026-65600). Risk of unauthorized operations or information disclosure. Exploitable via GET /api../admin. Mitigation: upgrade to 2.11.52 or later.

Original description

The description as published by the source.

Summary

There is a critical authentication-bypass vulnerability in Traefik's ReplacePathRegex middleware. When it is configured with a regular expression that captures user-controlled path segments without a mandatory separator (for example regex: "^/api(.*)", replacement: "/$1"), a crafted request can produce an un-normalized replacement path such as /../admin, which Traefik forwarded to the backend without validation. A backend that normalizes the path may resolve it to a protected route, letting an unauthenticated attacker reach resources located behind authentication middleware. This is the same class of issue that was fixed for StripPrefix in CVE-2026-48020; that post-replacement normalization check had not been applied to ReplacePathRegex. The fix rejects any request whose replaced path does not match its normalized form.

Patches

For more information

If you have any questions or comments about this advisory, please open an issue.

Original Description

Summary

A path traversal vulnerability in the ReplacePathRegex middleware allows an unauthenticated remote attacker to bypass authentication middleware and access protected routes by sending a single crafted HTTP request. The vulnerability exists because ReplacePathRegex does n…

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-2026-65600 has been found in github.com/traefik/traefik/v2.
Attackers can target a specific entry point like GET /api../admin over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade github.com/traefik/traefik/v2 to 2.11.52 or later.
If unsure, ask your IT team or search "github.com/traefik/traefik/v2 CVE-2026-65600" on the vendor's site.

CVE-2026-65600 (github.com/traefik/traefik/v2) — CWE-22 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: GET /api../admin / ReplacePathRegex / StripPrefix / ServeHTTP
Patched: 2.11.52 — 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

Path traversal (CWE-22) exists in github.com/traefik/traefik/v2. Attackers reach the vulnerable code path via GET /api../admin without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/traefik/traefik/v2. Attack surface: GET /api../admin / ReplacePathRegex / StripPrefix / ServeHTTP.

🔥 Severity

Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 2.11.52.

🛡️ 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 GET /api../admin requests with malformed payloads or SQL meta-characters. Run grep -r 'github.com/traefik/traefik/v2' . 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 'github.com/traefik/traefik/v2' . | 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/traefik/traefik/v2 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
    Hunt for indicators of compromise detect 
    grep 'GET /api../admin' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで GET /api../admin への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。

  3. 3
    Apply patch patch 
    Upgrade github.com/traefik/traefik/v2 to 2.11.52

    ステージング環境で 2.11.52 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 2 で見つけた異常検知の続報チェックを含めること。

  4. 4
    Post-deployment verification verify 
    Replay attack against GET /api../admin on staging to confirm patch closes the vector

    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 2 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/traefik/traefik/v2
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.52"}]}]
go github.com/traefik/traefik/v3
[{"type":"SEMVER","events":[{"introduced":"3.7.0"},{"fixed":"3.7.7"}]}]
go github.com/traefik/traefik
[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.7.34"}]}]

References

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