{"id":"CVE-2026-108082","title":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components","summary":"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 …","severity":"high","cvss":8.7,"cvssVector":"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","cwe":["CWE-1333"],"vendor":"sensiolabs","product":"symfony/http-foundation","affected":["symfony/http-foundation >= v4.1.0-BETA1 < v5.4.54","symfony/http-foundation >= v6.0.0-BETA1 < v6.4.46","symfony/http-foundation >= v7.0.0-BETA1 < v7.4.19","symfony/http-foundation >= v8.0.0-BETA1 < v8.1.7"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T19:17:19.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-108082","references":[{"url":"https://github.com/symfony/symfony/pull/66048","label":"596c5446-0ce5-4ba2-aa66-48b3b757a647"},{"url":"https://github.com/symfony/symfony/pull/66491","label":"596c5446-0ce5-4ba2-aa66-48b3b757a647"},{"url":"https://github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc","label":"596c5446-0ce5-4ba2-aa66-48b3b757a647"},{"url":"https://symfony.com/blog/cve-2026-108082-redos-in-headerutils-split-reachable-through-the-cache-control-request-header","label":"596c5446-0ce5-4ba2-aa66-48b3b757a647"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T18:04:09.776300Z"},"cvssSource":"cna","ingestedAt":"2026-10-15T15:09:08.431Z","slug":"CVE-2026-108082","body":"## Overview\n\nSymfony 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 (?<!\\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 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}