← Back
CVE-2026-45075
Authorization Flaw in symfony/http-kernel (CVE-2026-45075)
Summary
vulnerability in symfony/http-kernel (CVE-2026-45075). Risk of unauthorized operations or information disclosure. Exploitable via ``HEAD``. Mitigation: upgrade to `8.0.12` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-45075** has been found in symfony/http-kernel.
Attackers can target a specific entry point like ``HEAD`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade symfony/http-kernel to **8.0.12** or later.
If unsure, ask your IT team or search "symfony/http-kernel CVE-2026-45075" on the vendor's site.
CVE-2026-45075 (symfony/http-kernel) — CWE-863 /
Attack surface: `HEAD` / `GET` / `Location` / `methods`
Patched: `8.0.12` — 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
**incorrect authorization** (CWE-863) exists in symfony/http-kernel. Attackers reach the vulnerable code path via ``HEAD`` without authentication.
📍 Affected scope
symfony/http-kernel — . Attack surface: `HEAD` / `GET` / `Location` / `methods`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **8.0.12**.
🛡️ 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 'symfony/http-kernel' .` 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
-
1Identify exposure identify
grep -r 'symfony/http-kernel' . | 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 `symfony/http-kernel` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade symfony/http-kernel to 8.0.12ステージング環境で 8.0.12 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。
-
7Post-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
composer
symfony/http-kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.12"}]}]
composer
symfony/security-http
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.12"}]}]
composer
symfony/symfony
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.12"}]}]
Packagist
symfony/http-kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.12"}]}]
Packagist
symfony/security-http
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.12"}]}]
Packagist
symfony/symfony
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.12"}]}]
References
- package https://github.com/symfony/symfony
- web [email protected]
- web https://github.com/symfony/symfony/commit/fa8d5c67aa4b22c9656e3fd7d5c3aa59865bf838
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2026-45075.yaml
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2026-45075.yaml
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45075.yaml
- web https://symfony.com/cve-2026-45075
- web https://github.com/advisories/GHSA-6439-2f28-8p8q
- web [email protected]
- web [email protected]