Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M

CVE-2026-46634Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name

High 7.7

In plain English

A high-severity security flaw 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 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.7High

Exploit odds (30 days)0.6%top 50.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Twig is a template language for PHP. From 3.9.0 until 3.26.0, template_from_string() compiles an inner template under a synthesized __string_template__<hash> name that can fall outside a SourcePolicyInterface sandbox decision, allowing a sandboxed template that can call template_from_string and include to render an inner template without security policy enforcement. This issue is fixed in version 3.26.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	php-twig	3.27.0-0+deb13u1	DEBIAN-CVE-2026-46634
Debian:14	php-twig	3.26.0-1	DEBIAN-CVE-2026-46634
Packagist	twig/twig	3.26.0	GHSA-24x9-r6q4-q93w
Ubuntu:25.10	php-twig	no fix listed	UBUNTU-CVE-2026-46634
Ubuntu:26.10	php-twig	no fix listed	UBUNTU-CVE-2026-46634

Affected products (as reported)

Vendor	Product	Versions
twigphp	Twig	>= 3.9.0, < 3.26.0

Weakness: CWE-693 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/twigphp/Twig/security/advisories/GHSA-24x9-r6q4-q93w x_refsource_CONFIRM
https://github.com/twigphp/Twig/commit/1cde8f2b62463f85d47995fc25f8241cb409d915 x_refsource_MISC
https://github.com/twigphp/Twig/releases/tag/v3.26.0 x_refsource_MISC