Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M

CVE-2026-48806Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys

High 7.1

In plain English

A high-severity incorrect authorization in Twig from twigphp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.4%top 63.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	php-twig	3.27.0-1	DEBIAN-CVE-2026-48806
Packagist	twig/twig	3.27.0	GHSA-5v5v-ww74-355v
Ubuntu:25.10	php-twig	no fix listed	UBUNTU-CVE-2026-48806
Ubuntu:26.10	php-twig	no fix listed	UBUNTU-CVE-2026-48806

Affected products (as reported)

Vendor	Product	Versions
twigphp	Twig	< 3.27.0

Weakness: CWE-693, CWE-863 · Vector: 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

References

https://github.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355v x_refsource_CONFIRM
https://github.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105 x_refsource_MISC
https://github.com/twigphp/Twig/releases/tag/v3.27.0 x_refsource_MISC