What is CVE-2026-46627?

CVE-2026-46627 is a medium-severity vulnerability in Symfony Twig, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-14.

How severe is CVE-2026-46627?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Symfony Twig

CVE-2026-46627

Twig is a template language for PHP. Prior to 3.26.0, the Twig sandbox does not prevent a template from consuming CPU, memory, or wall-clock time, even under the strictest allow-list, allowing untrusted templates to cause resource exhaustion. This issue is addressed in version 3.26.0 by documenting that the sandbox does not protect against resource exhaustion.

Vulnerability class: DoS (Denial of Service)

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (44.8th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% 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-400 — Uncontrolled Resource Consumption

References

github.com/twigphp/Twig/security/advisories/GHSA-923g-j88x-j34q (Vendor Advisory)
github.com/twigphp/Twig/commit/6bfa285e2f98651adb7aa480bf83a741d154f09f (Patch)
github.com/twigphp/Twig/releases/tag/v3.26.0 (Release Notes)

Frequently asked questions

What is CVE-2026-46627?: CVE-2026-46627 is a medium-severity vulnerability in Symfony Twig, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-14.
How severe is CVE-2026-46627?: Medium severity. CVSS v3 base score is 6.5 out of 10.