{"id":"CVE-2026-46634","aliases":["CLSA-2026-1793789309","DEBIAN-CVE-2026-46634","EUVD-2026-44565","GHSA-24x9-r6q4-q93w","UBUNTU-CVE-2026-46634"],"status":"published","title":"Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name","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__\u003chash\u003e 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.","severity":{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00616,"percentile":0.49954,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-693"],"published":"2026-05-21T21:25:12Z","modified":"2026-11-04T14:45:06Z","fixes":[{"ecosystem":"Packagist","package":"twig/twig","fixed_in":["3.26.0"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:13","package":"php-twig","fixed_in":["3.27.0-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"php-twig","fixed_in":["3.26.0-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"twig/twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9.0"},{"fixed":"3.26.0"}]}]},{"source":"osv","ecosystem":"TuxCare:Packagist","package":"twig/twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"v2.16.1"},{"fixed":"v2.16.1-p3+tuxcare"}]}],"versions":["v2.16.1","v2.16.1-p1+tuxcare","v2.16.1-p2+tuxcare"],"bundled":2},{"source":"osv","ecosystem":"Debian:13","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.27.0-0+deb13u1"}]}],"versions":["3.20.0-2","3.21.1-1","3.21.1-2","3.21.1-3","3.22.0-1","3.22.0-2","3.22.1-1","3.22.1-2","3.22.1-3","3.22.2-1","3.22.2-2","3.23.0-1","3.23.0-2","3.24.0-1","3.26.0-0+deb13u1","3.26.0-1"]},{"source":"osv","ecosystem":"Debian:14","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.0-1"}]}],"versions":["3.20.0-2","3.21.1-1","3.21.1-2","3.21.1-3","3.22.0-1","3.22.0-2","3.22.1-1","3.22.1-2","3.22.1-3","3.22.2-1","3.22.2-2","3.23.0-1","3.23.0-2","3.24.0-1"]},{"source":"osv","ecosystem":"Packagist","package":"twig/twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9.0"},{"fixed":"3.26.0"}]}],"versions":["v3.10.0","v3.10.1","v3.10.2","v3.10.3","v3.11.0","v3.11.1","v3.11.2","v3.11.3","v3.12.0","v3.13.0","v3.14.0","v3.14.1","v3.14.2","v3.15.0","v3.16.0","v3.17.0","v3.17.1","v3.18.0","v3.19.0","v3.20.0","v3.21.0","v3.21.1","v3.22.0","v3.22.1","v3.22.2","v3.23.0","v3.24.0","v3.25.0","v3.9.0","v3.9.1","v3.9.2","v3.9.3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11.3-2","2.12.1-1","2.12.2-1","2.12.3-1","2.12.5-1","2.12.5-1ubuntu0.1~esm1","2.12.5-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.2-1ubuntu3","3.3.4-1","3.3.6-1","3.3.7-1","3.3.8-2ubuntu4","3.3.8-2ubuntu4+esm1","3.3.8-2ubuntu4+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.0-1","3.7.1-1","3.8.0-2","3.8.0-2ubuntu0.1~esm1","3.8.0-2ubuntu1","3.8.0-2ubuntu1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.20.0-2ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.23.0-2build7","3.27.1-1","3.28.0-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"php-twig","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.20.0-2ubuntu1","3.23.0-2build5","3.23.0-2build7","3.23.0-2ubuntu0.1~esm1"]}],"products":[{"vendor":"symfony","product":"twig"},{"vendor":"twigphp","product":"twig"}],"references":[{"url":"https://github.com/twigphp/Twig/security/advisories/GHSA-24x9-r6q4-q93w","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/twigphp/Twig/commit/1cde8f2b62463f85d47995fc25f8241cb409d915","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://github.com/twigphp/Twig/releases/tag/v3.26.0","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-46634.yaml","tags":["web"]},{"url":"https://symfony.com/cve-2026-46634","tags":["web"]},{"url":"https://github.com/advisories/GHSA-24x9-r6q4-q93w"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46634.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46634","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-46634","tags":["advisory"]},{"url":"https://github.com/twigphp/Twig","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-46634","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46634","tags":["report"]},{"url":"https://symfony.com/blog/cve-2026-46634-template-from-string-escapes-a-sourcepolicy-driven-sandbox-via-synthesized-template-name","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-46634","title":"Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name","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__\u003chash\u003e 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.","status":"published","published":"2026-07-14T21:19:17.804Z","modified":"2026-07-29T18:26:17.523Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T13:46:55.086623Z"}],"euvd":[{"id":"EUVD-2026-44565","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__\u003chash\u003e 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.","status":"published","published":"2026-07-14T21:19:17Z","modified":"2026-07-29T18:26:17Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"updated_at":"2026-11-02T18:02:29.807737Z"}],"ghsa":[{"id":"GHSA-24x9-r6q4-q93w","title":"Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name","description":"### Description\n\nWhen the sandbox is enabled selectively via `SourcePolicyInterface` (and not globally), a sandboxed template that is allowed to call `template_from_string` and `include` can render an arbitrary inner template with no security policy enforcement.\n\n`Environment::createTemplate()` compiles the inner string under a synthesized name (`__string_template__\u003chash\u003e`), so a name/path-based `SourcePolicy` returns `false` for it, and the inner template's `checkSecurity()` becomes a no-op. From a template the integrator believes is sandboxed, an attacker can use any tag/filter/function (including `constant()` to read secrets, or `|map(\"system\")` to execute shell commands).\n\n### Resolution\n\nThis is a configuration trap rather than a code bug: there is no legitimate use case for exposing `template_from_string` to untrusted template authors, and propagating the parent sandbox state through `template_from_string` would require invasive changes to `SourcePolicyInterface` semantics with their own risks.\n\nStarting with Twig 3.26.0, the documentation and the PHPDoc of `StringLoaderExtension::templateFromString()` explicitly warn against allowing `template_from_string` in a sandboxed environment (i.e. listing it in a `SecurityPolicy` allowed-functions list). Integrators using a `SourcePolicyInterface` MUST NOT allow `template_from_string` in their allowed functions; the safest option is not to register `StringLoaderExtension` at all when a sandbox is in use.\n\n### Credits\n\nTwig would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue.","status":"published","published":"2026-05-21T21:25:12Z","modified":"2026-05-21T21:25:13Z","cwes":["CWE-693"],"updated_at":"2026-11-02T14:40:13.628377Z"}],"nvd":[{"id":"CVE-2026-46634","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__\u003chash\u003e 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.","status":"published","published":"2026-07-14T22:16:56.13Z","modified":"2026-10-24T22:10:00.21Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:12:29.879716Z"}],"osv":[{"id":"CVE-2026-46634","title":"Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name","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__\u003chash\u003e 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.","status":"published","published":"2026-07-14T21:19:17.804Z","modified":"2026-10-28T02:31:10.684347096Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T15:45:06.231145Z"},{"id":"DEBIAN-CVE-2026-46634","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__\u003chash\u003e 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.","status":"published","published":"2026-07-14T22:16:56.13Z","modified":"2026-10-25T09:47:28.345655152Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:45:56.444225Z"},{"id":"UBUNTU-CVE-2026-46634","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__\u003chash\u003e 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.","status":"published","published":"2026-07-14T22:16:00Z","modified":"2026-10-17T12:58:25.139546688Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T16:56:30.797112Z"},{"id":"CLSA-2026-1793789309","title":"TuxCare security update for twig/twig (2 CVEs)","description":"TuxCare rebuilt twig/twig to address 2 CVEs. Fixed in v2.16.1-p3+tuxcare.","status":"published","published":"2026-11-04T11:48:30Z","modified":"2026-11-04T14:45:06.030035329Z","updated_at":"2026-11-04T15:03:54.132276Z"},{"id":"GHSA-24x9-r6q4-q93w","title":"Twig: `template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name","description":"### Description\n\nWhen the sandbox is enabled selectively via `SourcePolicyInterface` (and not globally), a sandboxed template that is allowed to call `template_from_string` and `include` can render an arbitrary inner template with no security policy enforcement.\n\n`Environment::createTemplate()` compiles the inner string under a synthesized name (`__string_template__\u003chash\u003e`), so a name/path-based `SourcePolicy` returns `false` for it, and the inner template's `checkSecurity()` becomes a no-op. From a template the integrator believes is sandboxed, an attacker can use any tag/filter/function (including `constant()` to read secrets, or `|map(\"system\")` to execute shell commands).\n\n### Resolution\n\nThis is a configuration trap rather than a code bug: there is no legitimate use case for exposing `template_from_string` to untrusted template authors, and propagating the parent sandbox state through `template_from_string` would require invasive changes to `SourcePolicyInterface` semantics with their own risks.\n\nStarting with Twig 3.26.0, the documentation and the PHPDoc of `StringLoaderExtension::templateFromString()` explicitly warn against allowing `template_from_string` in a sandboxed environment (i.e. listing it in a `SecurityPolicy` allowed-functions list). Integrators using a `SourcePolicyInterface` MUST NOT allow `template_from_string` in their allowed functions; the safest option is not to register `StringLoaderExtension` at all when a sandbox is in use.\n\n### Credits\n\nTwig would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue.","status":"published","published":"2026-05-21T21:25:12Z","modified":"2026-09-10T03:51:04.122036504Z","cwes":["CWE-693"],"updated_at":"2026-11-02T15:46:33.956911Z"}]}}