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CVE-2026-44889 medium CVSS 6.1

Open Redirect in webob (CVE-2026-44889)

Summary

vulnerability in webob (CVE-2026-44889). Risk of unauthorized operations or information disclosure. Exploitable via ``urllib.parse``. Mitigation: upgrade to `1.8.10` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-44889** has been found in webob. Attackers can target a specific entry point like ``urllib.parse`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10. What to do: upgrade webob to **1.8.10** or later. If unsure, ask your IT team or search "webob CVE-2026-44889" on the vendor's site.
CVE-2026-44889 (webob) — CWE-601 / CVSS v3 6.1 Attack vector: remote (network-reachable) / unauthenticated Attack surface: `urllib.parse` / `urlsplit` / `urljoin` / `example.org` Patched: `1.8.10` — apply immediately Workaround: Any use of the `Response` class that includes a `location` can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (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
**A vulnerability** (CWE-601) exists in webob. Attackers reach the vulnerable code path via ``urllib.parse`` without authentication.
📍 Affected scope
webob — . Attack surface: `urllib.parse` / `urlsplit` / `urljoin` / `example.org`.
🔥 Severity
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.8.10**.
🛡️ Workaround
Workaround: Any use of the `Response` class that includes a `location` can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (e.g.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'webob' .` 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 'webob' . | 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 `webob` 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
    Any use of the `Response` class that includes a `location` can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (e.g.

    パッチが適用されるまでの応急処置として、Any use of the `Response` class that includes a `location` can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (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 webob to 1.8.10

    ステージング環境で 1.8.10 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

pip webob
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.10"}]}]
PyPI webob
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.10"}]}]

References

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