by Kastro
Paper/Archive/CVE-2026-48806

CVE-2026-48806

twigphp Twig — Twig: Sandbox `__toString()` policy bypass via dynamic mapping keys

EPSS 0.4%CVSS 9.1
critical.is priorityof 100
35
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 36.1.361 × 207.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Twig is a template language for PHP. Prior to 3.27.0, ArrayExpression does not guard dynamic mapping keys that are coerced to strings, allowing PHP to invoke __toString() on a Stringable object used as a mapping key without calling SandboxExtension::ensureToStringAllowed(). This issue is fixed in version 3.27.0.

Affected

ProductAffectedFixed inSource
Twig< 3.27.0–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub_M (CNA)7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/twigphp/Twig/security/advisories/GHSA-5v5v-ww74-355vrefgithub.com/twigphp/Twig/commit/9ff41014639ef0e8eb50ac7669191c309d863105refgithub.com/twigphp/Twig/releases/tag/v3.27.0