CVE-2026-46634

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

HIGH 7.7

At a glance

Source: NVD
EPSS: EPSS 0.62 % · percentile 49 (2026-10-28)
State: PUBLISHED
Published: 2026-07-14 21:19 UTC
Updated: 2026-07-29 18:26 UTC
Assigner: GitHub_M
NVD status: Analyzed

Description

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.

Weaknesses (CWE)

CWE-693 — Protection Mechanism Failure

References

Scores

Version	Score	Vector	Scored by
CVSS 4.0	HIGH 7.7	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	GitHub_M
CVSS 4.0	HIGH 7.7	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

Advisories

GHSA-24x9-r6q4-q93w — Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name

European references

ENISA EUVD · EUVD-2026-44565
GCVE · GCVE-0-2026-46634

Affected configurations (NVD CPE)

cpe:2.3:a:symfony:twig:*:*:*:*:*:*:*:* ≥ 3.9.0 < 3.26.0

Affected products

Product	Versions
twigphp · Twig	affected >= 3.9.0, < 3.26.0

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD