by Kastro
Paper/Archive/CVE-2026-46634

CVE-2026-46634

twigphp Twig — Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 49.4.494 × 209.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Twig>= 3.9.0, < 3.26.0–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)7.7CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/twigphp/Twig/security/advisories/GHSA-24x9-r6q4-q93wrefgithub.com/twigphp/Twig/commit/1cde8f2b62463f85d47995fc25f8241cb409d915refgithub.com/twigphp/Twig/releases/tag/v3.26.0