{"id":"CVE-2026-108082","revision":"35f603edccf2457197d2fa16253928b8","records":[{"revision":"35f603edccf2457197d2fa16253928b8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-108082","aliases":[],"title":"Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to versions\u00A05.4.54,\u00A06.4.46,\u00A07.4.19, and\u00A08.1.7,\u00A0HeaderUtils::split() parsed header values with a pattern whose token alternative also matched whitespace, followed by a (?<!\\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.\n\n\n\nA 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.\n\n\n\nThis issue affects symfony/http-foundation\u00A0v4.1.0-BETA1 through v5.4.53, v6.0.0-BETA1 through\u00A0v6.4.45, v7.0.0-BETA1 through\u00A0v7.4.18, and v8.0.0-BETA1 through\u00A0v8.1.6.","state":0,"publishedAt":"2026-10-15T14:46:01.594+00:00","modifiedAt":"2026-10-15T18:04:45.913+00:00","affected":[{"ecosystem":"https://packagist.org/packages/symfony/http-foundation","name":"symfony/http-foundation","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"sensiolabs\",\n                    \"product\": \"symfony\",\n                    \"collectionURL\": \"https://packagist.org/packages/symfony/http-foundation\",\n                    \"packageName\": \"symfony/http-foundation\",\n                    \"repo\": \"https://github.com/symfony/http-foundation\",\n                    \"modules\": [\n                        \"Symfony\\\\Component\\\\HttpFoundation\\\\HeaderUtils::split()\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"v4.1.0-BETA1\",\n                            \"lessThan\": \"v5.4.54\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"v6.0.0-BETA1\",\n                            \"lessThan\": \"v6.4.46\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"v7.0.0-BETA1\",\n                            \"lessThan\": \"v7.4.19\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"v8.0.0-BETA1\",\n                            \"lessThan\": \"v8.1.7\",\n                            \"versionType\": \"git\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/symfony/symfony/pull/66048","https://github.com/symfony/symfony/pull/66491","https://github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc","https://symfony.com/blog/cve-2026-108082-redos-in-headerutils-split-reachable-through-the-cache-control-request-header"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108082","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-108082","identifiers":["CVE-2026-108082"]},"retained":false,"historicalAffected":[]}],"coverage":[]}