CVE-2026-48806

Twig is a template language for PHP. Prior to 3.27.0, ArrayExpression does not guard dynamic mapping keys that are coerced to strings, allowing PHP to invoke __toString() on a Stringable object used as a mapping key without calling SandboxExtension::ensureToStringAllowed(). This issue is fixed in version 3.27.0.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105	Patch
https://github.com/twigphp/Twig/releases/tag/v3.27.0	Release Notes
https://github.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355v	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:symfony:twig:*:*:*:*:*:*:*:*

History

24 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) Twig es un lenguaje de plantillas para PHP. Antes de la versión 3.27.0, ArrayExpression no protege las claves de mapeo dinámicas que son forzadas a cadenas, permitiendo a PHP invocar __toString() en un objeto Stringable utilizado como clave de mapeo sin llamar a SandboxExtension::ensureToStringAllowed(). Este problema se corrige en la versión 3.27.0.

Information

Published : 2026-07-14 22:17

Updated : 2026-10-24 22:10

NVD link : CVE-2026-48806

Mitre link : CVE-2026-48806

CVE.ORG link : CVE-2026-48806

JSON object : View

Products Affected

symfony

twig

CWE

CWE-693

Protection Mechanism Failure

CWE-863

Incorrect Authorization

{"id": "CVE-2026-48806", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-48806", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-15T12:47:04.147602Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.1, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "twigphp", "product": "Twig", "versions": [{"status": "affected", "version": "< 3.27.0"}]}]}], "published": "2026-07-14T22:17:04.943", "references": [{"url": "https://github.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/twigphp/Twig/releases/tag/v3.27.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355v", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-693"}, {"lang": "en", "value": "CWE-863"}]}], "descriptions": [{"lang": "en", "value": "Twig is a template language for PHP. Prior to 3.27.0, ArrayExpression does not guard dynamic mapping keys that are coerced to strings, allowing PHP to invoke __toString() on a Stringable object used as a mapping key without calling SandboxExtension::ensureToStringAllowed(). This issue is fixed in version 3.27.0."}, {"lang": "es", "value": "Twig es un lenguaje de plantillas para PHP. Antes de la versi\u00f3n 3.27.0, ArrayExpression no protege las claves de mapeo din\u00e1micas que son forzadas a cadenas, permitiendo a PHP invocar __toString() en un objeto Stringable utilizado como clave de mapeo sin llamar a SandboxExtension::ensureToStringAllowed(). Este problema se corrige en la versi\u00f3n 3.27.0."}], "lastModified": "2026-10-24T22:10:00.210", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:symfony:twig:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E6B5C37C-83AB-43D0-9297-2D2B7815DF4A", "versionEndExcluding": "3.27.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}