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CVE-2026-42154 high CVSS 7.5

Vulnerability in github.com/prometheus/prometheus (CVE-2026-42154)

Summary

vulnerability in github.com/prometheus/prometheus (CVE-2026-42154). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `3.11.3` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-42154** has been found in github.com/prometheus/prometheus. Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10. What to do: upgrade github.com/prometheus/prometheus to **3.11.3** or later. If unsure, ask your IT team or search "github.com/prometheus/prometheus CVE-2026-42154" on the vendor's site.
CVE-2026-42154 (github.com/prometheus/prometheus) — CWE-400 / CVSS v3 7.5 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `3.11.3` — apply immediately Workaround: User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read. 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-400) exists in github.com/prometheus/prometheus.
📍 Affected scope
github.com/prometheus/prometheus — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **3.11.3**.
🛡️ Workaround
Workaround: User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'github.com/prometheus/prometheus' .` 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/prometheus/prometheus' . | 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/prometheus/prometheus` 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
    User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read.

    パッチが適用されるまでの応急処置として、User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read. 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/prometheus/prometheus to 3.11.3

    ステージング環境で 3.11.3 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/prometheus/prometheus
[{"type":"SEMVER","events":[{"introduced":"1.0.0-rc.0"},{"last_affected":"2.5.0"}]}]

References

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