Critical severity · published Jul 14, 2026
CVE-2026-48806
Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys
9.1
CVSS
0.4%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TW
Twig · twigphp
< 3.27.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48806
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48806
Patch
https://github.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105
Release Notes
https://github.com/twigphp/Twig/releases/tag/v3.27.0
Vendor Advisory
https://github.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355v
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