Authorization Flaw in twig/twig (CVE-2026-46635)
Summary
Vulnerability in twig/twig (CVE-2026-46635). Risk of unauthorized operations or information disclosure. Exploitable via column. Mitigation: upgrade to 3.26.0 or later.
Original description
The description as published by the source.
Description
The column filter passes its input straight to PHP's native array_column(). When the array elements are objects, array_column() reads $obj->$name (and $obj->$index) directly, including invoking __get/__isset. Because this property read happens entirely in PHP native code and never reaches CoreExtension::getAttribute(), SandboxExtension::checkPropertyAllowed() is never consulted.
An untrusted template author with column in their allowedFilters list can therefore read any public or magic property of any object reachable in the render context, regardless of the SecurityPolicy allowedProperties list. This is a variant of CVE-2024-51755 / GHSA-jjxq-ff2g-95vh that the ArrayAccess-focused fix did not cover.
Resolution
The column filter now routes object property reads through the sandbox-aware attribute accessor so the property allowlist is enforced.
Credits
Twig: would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.
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-2026-46635 has been found in twig/twig.
Attackers can target a specific entry point like column over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade twig/twig to 3.26.0 or later.
If unsure, ask your IT team or search "twig/twig CVE-2026-46635" on the vendor's site.
CVE-2026-46635 (twig/twig) — CWE-863 / CVSS v3 4.3
Attack vector: remote (network-reachable) / no user interaction
Attack surface: column / __get / __isset / allowedFilters
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 column.
Check the vendor advisory for the affected versions of twig/twig. Attack surface: column / __get / __isset / allowedFilters.
Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.
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-2026-46635 php-twig
- Ubuntu UBUNTU-CVE-2026-46635 php-twig
References
- package github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- web github.com
- web symfony.com
- web github.com
- web security-advisories@github.com