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CVE-2026-42999 medium CVSS 6.0

Vulnerability in keystone (CVE-2026-42999)

Summary

Vulnerability in keystone (CVE-2026-42999). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 29.0.2 or later.

Original description

The description as published by the source.

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone RBAC policy enforcer in enforce_call unconditionally merges the raw JSON request body into the policy enforcement dictionary via policy_dict.update(json_input.copy()), overwriting trusted target data that was previously set from database lookups. Because flask.request.get_json is called with force=True, this works regardless of Content-Type or HTTP method. Any authenticated user can inject arbitrary policy target attributes (e.g., user_id, project_id) into the request body to bypass RBAC checks and perform unauthorized operations on resources belonging to other users or projects. This was introduced in commit 5ea59f52 (Rocky/14.0.0).

Source: NIST National Vulnerability Database 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-2026-42999 has been found in keystone.
Risk of unauthorized operations or information disclosure. CVSS score: 6.0/10.
What to do: upgrade keystone to 29.0.2 or later.
If unsure, ask your IT team or search "keystone CVE-2026-42999" on the vendor's site.

CVE-2026-42999 (keystone) — CWE-639 / CVSS v3 6.0
Attack vector: remote (network-reachable) / no user interaction
Patched: 29.0.2 — 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

A vulnerability (CWE-639) exists in keystone.

📍 Affected scope

Check the vendor advisory for the affected versions of keystone.

🔥 Severity

Severity: Medium (CVSS 6.0/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 29.0.2.

🛡️ 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 request patterns matching this CVE's known IOCs. Run grep -r 'keystone' . 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 'keystone' . | 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 keystone 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
    Apply patch patch 
    Upgrade keystone to 29.0.2

    ステージング環境で 29.0.2 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を含めること。

  3. 3
    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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip keystone
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"29.0.2"}]}]
PyPI keystone
[{"type":"ECOSYSTEM","events":[{"introduced":"29.0.0"},{"fixed":"29.0.2"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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