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CVE-2026-48736
Vulnerability in symfony/http-client (CVE-2026-48736)
Summary
vulnerability in symfony/http-client (CVE-2026-48736). Risk of unauthorized operations or information disclosure. Exploitable via ``NoPrivateNetworkHttpClient``. Mitigation: upgrade to `5.4.53` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-48736** has been found in symfony/http-client.
Attackers can target a specific entry point like ``NoPrivateNetworkHttpClient`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade symfony/http-client to **5.4.53** or later.
If unsure, ask your IT team or search "symfony/http-client CVE-2026-48736" on the vendor's site.
CVE-2026-48736 (symfony/http-client) — CWE-184 /
Attack surface: `NoPrivateNetworkHttpClient` / `false`
Patched: `5.4.53` — 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-184) exists in symfony/http-client. Attackers reach the vulnerable code path via ``NoPrivateNetworkHttpClient`` without authentication.
📍 Affected scope
symfony/http-client — . Attack surface: `NoPrivateNetworkHttpClient` / `false`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.4.53**.
🛡️ 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-client' .` 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
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1Identify exposure identify
grep -r 'symfony/http-client' . | 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-client` 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-client to 5.4.53ステージング環境で 5.4.53 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。
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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-client
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.53"}]}]
composer
symfony/http-foundation
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.13"}]}]
composer
symfony/symfony
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.13"}]}]
Packagist
symfony/http-client
[{"type":"ECOSYSTEM","events":[{"introduced":"5.4.0"},{"fixed":"5.4.53"}]}]
Packagist
symfony/http-foundation
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.13"}]}]
Packagist
symfony/symfony
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.13"}]}]
References
- package https://github.com/symfony/symfony
- web https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755
- web https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2
- web https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-client/CVE-2026-48736.yaml
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2026-48736.yaml
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48736.yaml
- web https://symfony.com/cve-2026-48736
- web https://github.com/advisories/GHSA-38cx-cq6f-5755