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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 0.305.2, 0.311.3 or later.

Original description

The description as published by the source.

Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process. This issue has been patched in versions 3.5.3 and 3.11.3.

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-2026-42154 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 0.305.2, 0.311.3 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: 0.305.2, 0.311.3 — 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-400) exists in github.com/prometheus/prometheus.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/prometheus/prometheus.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 0.305.2, 0.311.3.

🛡️ 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 'github.com/prometheus/prometheus' . 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/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. 2
    Apply patch patch 
    Upgrade github.com/prometheus/prometheus to 0.305.2, 0.311.3

    ステージング環境で 0.305.2, 0.311.3 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

Go github.com/prometheus/prometheus
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.305.2"},{"introduced":"0.306.0"},{"fixed":"0.311.3"},{"introduced":"1.0.0-rc.0"}]}]
Go github.com/prometheus/prometheus/v2
[{"type":"SEMVER","events":[{"introduced":"0"}]}]
Bitnami prometheus
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.305.3"},{"introduced":"0.306.0"},{"fixed":"0.311.3"},{"introduced":"1.0.0"},{"fixed":"3.5.3"},{"introduced":"3.6.0"},{"fixed":"3.11.3"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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