Authorization Flaw in twig/twig (CVE-2026-47732)
Summary
Vulnerability in twig/twig (CVE-2026-47732). Confidential information can be exposed externally. Exploitable via SandboxNodeVisitor. Mitigation: upgrade to 3.26.0 or later.
Original description
The description as published by the source.
Twig is a template language for PHP. Prior to 3.26.0, several Twig language constructs trigger PHP string coercion on a Stringable operand without consulting SecurityPolicy::checkMethodAllowed(), allowing a sandboxed template author to invoke __toString() on objects reachable in the render context through conditional expressions, comparison operators, tests, template-loading tags, dynamic attribute names, spread arguments, the do tag, and the .. range operator. This issue is fixed in version 3.26.0.
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-2026-47732 has been found in twig/twig.
Attackers can target a specific entry point like SandboxNodeVisitor over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade twig/twig to 3.26.0 or later.
If unsure, ask your IT team or search "twig/twig CVE-2026-47732" on the vendor's site.
CVE-2026-47732 (twig/twig) — CWE-863 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: SandboxNodeVisitor / CheckToStringNode / Stringable / __toString
Patched: 3.26.0 — 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.
Incorrect authorization (CWE-863) exists in twig/twig. Attackers reach the vulnerable code path via SandboxNodeVisitor.
Check the vendor advisory for the affected versions of twig/twig. Attack surface: SandboxNodeVisitor / CheckToStringNode / Stringable / __toString.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to 3.26.0.
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 'twig/twig' . 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
-
1Identify exposure identify
grep -r 'twig/twig' . | 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
twig/twig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 twig/twig to 3.26.0ステージング環境で 3.26.0 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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-47732 php-twig
- Ubuntu UBUNTU-CVE-2026-47732 php-twig
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- web github.com
- web github.com
- web symfony.com
- web github.com