Vulnerability in github.com/dunglas/frankenphp (CVE-2026-45062)
Summary
Vulnerability in github.com/dunglas/frankenphp (CVE-2026-45062). Successful exploitation can lead to full system takeover. Exploitable via cgi.go. Mitigation: upgrade to 1.12.3 or later.
Original description
The description as published by the source.
FrankenPHP is a modern application server for PHP. From version 1.11.2 to before version 1.12.3, the splitPos() function in cgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead FrankenPHP into treating a non-.php file as a .php script. In any deployment where the attacker can place content into a file served by FrankenPHP (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This issue has been patched in version 1.12.3.
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-2026-45062 has been found in github.com/dunglas/frankenphp.
Attackers can target a specific entry point like cgi.go over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: upgrade github.com/dunglas/frankenphp to 1.12.3 or later.
If unsure, ask your IT team or search "github.com/dunglas/frankenphp CVE-2026-45062" on the vendor's site.
CVE-2026-45062 (github.com/dunglas/frankenphp) — CWE-176 / CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: cgi.go / search.IgnoreCase / match / break
Patched: 1.12.3 — 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.
A vulnerability (CWE-176) exists in github.com/dunglas/frankenphp. Attackers reach the vulnerable code path via cgi.go without authentication.
Check the vendor advisory for the affected versions of github.com/dunglas/frankenphp. Attack surface: cgi.go / search.IgnoreCase / match / break.
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover.
Update to 1.12.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/dunglas/frankenphp' . 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
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1Identify exposure identify
grep -r 'github.com/dunglas/frankenphp' . | 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/dunglas/frankenphpを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/dunglas/frankenphp to 1.12.3ステージング環境で 1.12.3 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。
-
3Post-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
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com
- web github.com
- web github.com