Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M

CVE-2026-46629Twig: Unbounded formatter memoisation in twig/intl-extra keyed on template-controlled arguments

Medium 5.3

In plain English

A medium-severity resource allocation without limits 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 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.5%top 54.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Twig is a template language for PHP. Prior to 3.26.0, twig/intl-extra memoises IntlDateFormatter and NumberFormatter instances in arrays keyed by template-controlled filter arguments such as locale, pattern, and attrs, allowing a template to allocate many ICU formatter objects that remain pinned for the lifetime of the Twig\Environment. This issue is fixed in version 3.26.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	php-twig	3.5.1-1+deb12u3	DEBIAN-CVE-2026-46629
Debian:13	php-twig	3.27.0-0+deb13u1	DEBIAN-CVE-2026-46629
Debian:14	php-twig	3.26.0-1	DEBIAN-CVE-2026-46629
Packagist	twig/intl-extra	3.26.0	GHSA-35wc-cvqg-78fp
Ubuntu:25.10	php-twig	no fix listed	UBUNTU-CVE-2026-46629
Ubuntu:26.10	php-twig	no fix listed	UBUNTU-CVE-2026-46629

Affected products (as reported)

Vendor	Product	Versions
twigphp	Twig	< 3.26.0

Weakness: CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

https://github.com/twigphp/Twig/security/advisories/GHSA-35wc-cvqg-78fp x_refsource_CONFIRM
https://github.com/twigphp/Twig/commit/6add9066fc5c0455eb764c1f3af6e4e4e3562419 x_refsource_MISC
https://github.com/twigphp/Twig/releases/tag/v3.26.0 x_refsource_MISC