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CVE-2026-27654 high CVSS 8.2

Vulnerability in nginx (CVE-2026-27654)

Summary

Vulnerability in nginx (CVE-2026-27654). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.28.3, 1.29.7 or later.

Original description

The description as published by the source.

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker process or modification of source or destination file names outside the document root. This issue affects NGINX Open Source and NGINX Plus when the configuration file uses DAV module MOVE or COPY methods, prefix location (nonregular expression location configuration), and alias directives. The integrity impact is constrained because the NGINX worker process user has low privileges and does not have access to the entire system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Source: GitHub Security Advisories (Global) 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-2026-27654 has been found in nginx.
Risk of unauthorized operations or information disclosure. CVSS score: 8.2/10.
What to do: upgrade nginx to 1.28.3, 1.29.7 or later.
If unsure, ask your IT team or search "nginx CVE-2026-27654" on the vendor's site.

CVE-2026-27654 (nginx) — CWE-122 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.28.3, 1.29.7 — 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-122) exists in nginx.

📍 Affected scope

Check the vendor advisory for the affected versions of nginx.

🔥 Severity

Severity: High (CVSS 8.2/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 1.28.3, 1.29.7.

🛡️ 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 1.28.3, 1.29.7

    ステージング環境で 1.28.3, 1.29.7 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":"0.5.13"},{"fixed":"1.28.3"},{"introduced":"1.29.0"},{"fixed":"1.29.7"}]}]
Bitnami nginx-gateway
[{"type":"SEMVER","events":[{"introduced":"0.5.13"},{"fixed":"1.28.3"},{"introduced":"1.29.0"},{"fixed":"1.29.7"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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