What is CVE-2026-46638?

CVE-2026-46638 is a high-severity vulnerability in Symfony Twig, classified under Protection Mechanism Failure. CVSS score: 8.1/10. Published 2026-07-14.

How severe is CVE-2026-46638?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Symfony Twig

CVE-2026-46638

Twig is a template language for PHP. Prior to 3.26.0, {% sandbox %}{% include %} can include a template that was previously loaded outside the sandbox without re-invoking checkSecurity(), allowing the cached template to use tags, filters, and functions that should have been denied by SecurityPolicy::checkSecurity(). This issue is fixed in version 3.26.0.

Published 2026-07-14 · last modified 2026-07-16.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (40.0th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Symfony Twig
Twigphp Twig — versions < 3.26.0

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

github.com/twigphp/Twig/security/advisories/GHSA-7fxw-r6jv-74c8 (Vendor Advisory)
github.com/twigphp/Twig/commit/819c6a89fe0f261b8555c4f4d5e27d31984223ea (Patch)
github.com/twigphp/Twig/releases/tag/v3.26.0 (Release Notes)

Frequently asked questions

What is CVE-2026-46638?: CVE-2026-46638 is a high-severity vulnerability in Symfony Twig, classified under Protection Mechanism Failure. CVSS score: 8.1/10. Published 2026-07-14.
How severe is CVE-2026-46638?: High severity. CVSS v3 base score is 8.1 out of 10.