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CVE-2026-24425 high CVSS 8.8

Vulnerability in twig/twig (CVE-2026-24425)

Summary

Vulnerability in twig/twig (CVE-2026-24425). Successful exploitation can lead to full system takeover. Exploitable via SourcePolicyInterface. Mitigation: upgrade to 3.26.0 or later.

Original description

The description as published by the source.

Description

When using the sandbox with a SourcePolicyInterface, Twig does not always apply the sandbox restriction that forbids non-Closure callbacks for callback-accepting filters.

The issue affects the sort, filter, map, and reduce filters.

In the affected versions, the runtime check that rejects non-Closure callbacks in sandbox mode does not use the current template Source. As a result, when the sandbox is enabled through a source policy instead of being enabled globally, Twig can incorrectly treat the current execution as non-sandboxed for these callback checks.

This can allow user-controlled templates to pass arbitrary PHP callables to callback-accepting filters even though the template is being sandboxed through a source policy.

The issue happens when all these conditions are met:

  • The sandbox is not enabled globally;
  • A SourcePolicyInterface enables the sandbox for the rendered template;
  • The template uses one of the sort, filter, map, or reduce filters;
  • The callback is not a Closure.

Resolution

The patch makes callback sandbox checks source-aware by propagating the current template Source to callback-accepting filters and using it when deciding whether sandbox restrictions apply.

Credits

We would like to thank XavLim and Wade Sparks for reporting the issue and Fabien Potencier for fixing the issue.

Source: NIST National Vulnerability Database 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-2026-24425 has been found in twig/twig.
Attackers can target a specific entry point like SourcePolicyInterface over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade twig/twig to 3.26.0 or later.
If unsure, ask your IT team or search "twig/twig CVE-2026-24425" on the vendor's site.

CVE-2026-24425 (twig/twig) — CWE-693 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Attack surface: SourcePolicyInterface / Closure / sort / filter
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.

❓ What is the problem

A vulnerability (CWE-693) exists in twig/twig. Attackers reach the vulnerable code path via SourcePolicyInterface.

📍 Affected scope

Check the vendor advisory for the affected versions of twig/twig. Attack surface: SourcePolicyInterface / Closure / sort / filter.

🔥 Severity

Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 3.26.0.

🛡️ 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 '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

  1. 1
    Identify 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。

  2. 2
    Apply 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。

  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

composer twig/twig
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.0"}]}]
Packagist twig/twig
[{"type":"ECOSYSTEM","events":[{"introduced":"3.9.0"},{"fixed":"3.26.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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