CVE-2026-46627: twig DoS — Fix

Description

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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0039

Probability of exploitation

0.31%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
symfony	twig	< 3.26.0

References

Advisories & Patches

https://github.com/twigphp/Twig/commit/6bfa285e2f98651adb7aa480bf83a741d154f09f https://github.com/twigphp/Twig/security/advisories/GHSA-923g-j88x-j34q

Other References

https://github.com/twigphp/Twig/releases/tag/v3.26.0

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-46627? +

CVE-2026-46627 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0039, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-46627? +

CVE-2026-46627 affects products from symfony, specifically: twig. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-46627? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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