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CVE-2026-42926 medium CVSS 5.8

Vulnerability in nginx (CVE-2026-42926)

Summary

Vulnerability in nginx (CVE-2026-42926). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.30.1 or later.

Original description

The description as published by the source.

When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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-2026-42926 has been found in nginx.
Risk of unauthorized operations or information disclosure. CVSS score: 5.8/10.
What to do: upgrade nginx to 1.30.1 or later.
If unsure, ask your IT team or search "nginx CVE-2026-42926" on the vendor's site.

CVE-2026-42926 (nginx) — CWE-172 / CVSS v3 5.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.30.1 — 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-172) exists in nginx.

📍 Affected scope

Check the vendor advisory for the affected versions of nginx.

🔥 Severity

Severity: Medium (CVSS 5.8/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 1.30.1.

🛡️ 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 'nginx' . 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 'nginx' . | 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 nginx 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 nginx to 1.30.1

    ステージング環境で 1.30.1 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

Bitnami nginx
[{"type":"SEMVER","events":[{"introduced":"1.29.4"},{"fixed":"1.30.1"}]}]
Bitnami nginx-gateway
[{"type":"SEMVER","events":[{"introduced":"1.29.4"},{"fixed":"1.30.1"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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