{"id":"DEBIAN-CVE-2026-109413","details":"In Symfony YAML prior to versions 5.4.54, 6.4.45, 7.4.18, and 8.1.6, Yaml\\Parser::lexInlineStructure() recursed through lexInlineMapping() and lexInlineSequence() for every { and [ of an inline collection, without entering the nesting level that the rest of the parser bounds with maxNestingLevel. A document made of deeply nested inline collections, such as [[[[...]]]], exhausted the stack while it was being lexed: depending on the PHP version and its stack settings, the process crashed or the request ended with a fatal error.    Any code parsing untrusted YAML is affected. That includes #[MapRequestPayload] when the Yaml component is installed and the endpoint does not restrict acceptFormat: a single unauthenticated request with a YAML content type is enough.    This issue affects symfony/yaml through v5.4.53, v6.0.0-BETA1 through v6.4.44, v7.0.0-BETA1 through v7.4.17, and v8.0.0-BETA1 through v8.1.5.","modified":"2026-10-17T15:00:08.029511899Z","published":"2026-10-15T15:17:24.993Z","upstream":["CVE-2026-109413"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-109413"}],"affected":[{"package":{"name":"symfony","ecosystem":"Debian:12","purl":"pkg:deb/debian/symfony?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.23+dfsg-1","5.4.23+dfsg-1+deb12u1","5.4.23+dfsg-1+deb12u2","5.4.23+dfsg-1+deb12u3","5.4.23+dfsg-1+deb12u4","5.4.23+dfsg-1+deb12u5","5.4.24+dfsg-1","5.4.25+dfsg-1","5.4.27+dfsg-1","5.4.28+dfsg-1","5.4.29+dfsg-1","5.4.30+dfsg-1","5.4.31+dfsg-1","5.4.31+dfsg-2","5.4.32+dfsg-1","5.4.33+dfsg-1","5.4.34+dfsg-1","5.4.34+dfsg-2","5.4.35+dfsg-1","5.4.35+dfsg-2","5.4.35+dfsg-3","5.4.52+dfsg-0+deb12u1","5.4.53+dfsg-0+deb12u1","6.3.0+dfsg-1","6.3.0~rc1+dfsg-1","6.3.0~rc2+dfsg-1","6.3.1+dfsg-1","6.3.3+dfsg-1","6.3.4+dfsg-1","6.3.5+dfsg-1","6.3.6+dfsg-1","6.3.7+dfsg-1","6.4.0+dfsg-1","6.4.0~beta2+dfsg-1","6.4.0~beta3+dfsg-1","6.4.0~rc1+dfsg-1","6.4.0~rc2+dfsg-1","6.4.1+dfsg-1","6.4.10+dfsg-1","6.4.11+dfsg-1","6.4.12+dfsg-1","6.4.13+dfsg-1","6.4.14+dfsg-1","6.4.15+dfsg-1","6.4.16+dfsg-1","6.4.16+dfsg-2","6.4.17+dfsg-1","6.4.17+dfsg-2","6.4.17+dfsg-3","6.4.17+dfsg-4","6.4.17+dfsg-5","6.4.17+dfsg-6","6.4.18+dfsg-1","6.4.19+dfsg-1","6.4.19+dfsg-2","6.4.2+dfsg-1","6.4.20+dfsg-1","6.4.20+dfsg-2","6.4.21+dfsg-1","6.4.21+dfsg-2","6.4.24+dfsg-1","6.4.25+dfsg-1","6.4.3+dfsg-1","6.4.4+dfsg-1","6.4.4+dfsg-2","6.4.4+dfsg-3","6.4.4+dfsg-4","6.4.5+dfsg-1","6.4.5+dfsg-2","6.4.5+dfsg-3","6.4.5+dfsg-4","6.4.6+dfsg-1","6.4.7+dfsg-1","6.4.9+dfsg-1","7.0.4+dfsg-1","7.0.5+dfsg-1","7.0.6+dfsg-1","7.0.7+dfsg-1","7.1.0~beta1+dfsg-1","7.1.0~rc1+dfsg-1","7.1.2+dfsg-1","7.1.3+dfsg-1","7.1.4+dfsg-1","7.1.5+dfsg-1","7.2.0~beta1+dfsg-1","7.2.0~beta2+dfsg-1","7.2.0~rc1+dfsg-1","7.2.1+dfsg-1","7.2.2+dfsg-1","7.2.3+dfsg-1","7.2.4+dfsg-1","7.2.5+dfsg-1","7.2.6-1","7.3.0+dfsg-1","7.3.0~beta1+dfsg-1","7.3.0~beta2+dfsg-1","7.3.0~rc1+dfsg-1","7.3.1+dfsg-1","7.3.2+dfsg-1","7.3.3+dfsg-1","7.3.4+dfsg-1","7.3.5-1","7.4.0+dfsg-1","7.4.0+dfsg-2","7.4.0~beta1-1","7.4.0~beta1-2","7.4.0~beta2+dfsg-1","7.4.0~beta2+dfsg-2","7.4.0~beta2+dfsg-3","7.4.0~rc1+dfsg-1","7.4.0~rc2+dfsg-1","7.4.0~rc3+dfsg-1","7.4.10+dfsg-1","7.4.12+dfsg-1","7.4.13+dfsg-1","7.4.13+dfsg-2","7.4.14+dfsg-1","7.4.15+dfsg-1","7.4.15+dfsg-2","7.4.16+dfsg-1","7.4.17+dfsg-1","7.4.18+dfsg-1","7.4.19+dfsg-1","7.4.2+dfsg-1","7.4.2+dfsg-2","7.4.20+dfsg-1","7.4.21+dfsg-1","7.4.3+dfsg-1","7.4.4+dfsg-1","7.4.5+dfsg-1","7.4.6+dfsg-1","7.4.6+dfsg-2","7.4.7+dfsg-1","7.4.8+dfsg-1","7.4.9+dfsg-1","8.0.0+dfsg-1","8.0.0~beta2+dfsg-1","8.0.0~beta2+dfsg-2","8.0.0~rc1+dfsg-1","8.0.0~rc2+dfsg-1","8.0.0~rc3+dfsg-1","8.0.10-1","8.0.11+dfsg-1","8.0.12+dfsg-1","8.0.13+dfsg-1","8.0.2+dfsg-1","8.0.3+dfsg-1","8.0.4+dfsg-1","8.0.5+dfsg-1","8.0.6+dfsg-1","8.0.7+dfsg-1","8.0.8+dfsg-1","8.0.9+dfsg-1","8.1.0+dfsg-1","8.1.1+dfsg-1","8.1.3+dfsg-1","8.1.4+dfsg-1","8.1.5+dfsg-1","8.1.6+dfsg-1","8.1.7+dfsg-1","8.1.8+dfsg-1","8.1.9+dfsg-1"],"ecosystem_specific":{"urgency":"not 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