High
Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-48806
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 00:29 UTC · Revision 1
Source evidence
Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys
core-osv · Original sourcePublished 14 Jul 2026, 21:28 UTC
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.
osv:CVE-2026-48806
Complete source record
{
"id": "b32dc905c0ca646f50c7c4bc7477be7f52b06683a35702945f2504fae1dbf210",
"url": "https://osv.dev/vulnerability/CVE-2026-48806",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys",
"summary": "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.",
"evidence": "osv:CVE-2026-48806",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-48806",
"aliases": [
"CVE-2026-48806",
"GHSA-5v5v-ww74-355v"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/twigphp/twig",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "04ae1bfe9463c816cf72ca0abe7eae2c77a9a9ed"
},
{
"fixed": "9ff41014639ef0e8eb50ac7669191c309d863105"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:symfony:twig:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.27.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "9ff41014639ef0e8eb50ac7669191c309d863105"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "04ae1bfe9463c816cf72ca0abe7eae2c77a9a9ed"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.27.0"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48806.json"
}
}
],
"modified": "2026-10-28T02:30:52.147321884Z",
"provider": "osv",
"references": [
"https://github.com/twigphp/Twig/releases/tag/v3.27.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48806.json",
"https://github.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355v",
"https://nvd.nist.gov/vuln/detail/CVE-2026-48806",
"https://github.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105"
],
"provider_metadata": {
"cwe_ids": [
"CWE-693",
"CWE-863"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48806.json"
}
},
"related_cves": [
{
"value": "CVE-2026-48806",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 520974,
"published_at": "2026-07-14T21:28:08.781+00:00"
}