{"id":"DEBIAN-CVE-2026-108082","details":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to versions 5.4.54, 6.4.46, 7.4.19, and 8.1.7, HeaderUtils::split() parsed header values with a pattern whose token alternative also matched whitespace, followed by a (?\u003c!\\s) lookbehind. A run of whitespace placed before a separator could be divided among the iterations of the enclosing repetition in exponentially many ways, and the engine tried all of them before settling. HeaderBag calls it for the Cache-Control header whenever a Request is built, so any application handling HTTP requests is reachable, with no authentication.    A single request carrying such a header costs close to a second of CPU (813 ms for a run of 17 spaces in an 8 KB header on PHP 8.5, doubling with each extra space). From 18 spaces on, preg_match_all() gives up at pcre.backtrack_limit and split() returns an empty array, so every directive of the header is silently dropped.    This issue affects symfony/http-foundation v4.1.0-BETA1 through v5.4.53, v6.0.0-BETA1 through v6.4.45, v7.0.0-BETA1 through v7.4.18, and v8.0.0-BETA1 through v8.1.6.","modified":"2026-10-17T15:00:08.040160258Z","published":"2026-10-15T15:17:22.583Z","upstream":["CVE-2026-108082"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-108082"}],"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 yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108082.json"}},{"package":{"name":"symfony","ecosystem":"Debian:13","purl":"pkg:deb/debian/symfony?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.4.21+dfsg-2","6.4.21+dfsg-2+deb13u1","6.4.24+dfsg-1","6.4.25+dfsg-1","6.4.40+dfsg-0+deb13u1","6.4.41+dfsg-0+deb13u1","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 yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108082.json"}},{"package":{"name":"symfony","ecosystem":"Debian:14","purl":"pkg:deb/debian/symfony?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.4.19+dfsg-1"}]}],"versions":["6.4.21+dfsg-2","6.4.24+dfsg-1","6.4.25+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","7.4.2+dfsg-1","7.4.2+dfsg-2","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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-108082.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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"}]}