{"id":"CVE-2026-108082","state":"PUBLISHED","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 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.","publishedAt":"2026-10-15T14:46:01.594Z","updatedAt":"2026-10-15T18:04:45.913Z","severity":{"score":8.7,"label":"High","version":"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","source":"Checkmarx"},"assigner":"Checkmarx","products":["sensiolabs symfony"],"affected":[{"vendor":"sensiolabs","product":"symfony","packageName":"symfony/http-foundation","defaultStatus":"unaffected","versions":[{"version":"v4.1.0-BETA1","status":"affected","lessThan":"v5.4.54","versionType":"git"},{"version":"v6.0.0-BETA1","status":"affected","lessThan":"v6.4.46","versionType":"git"},{"version":"v7.0.0-BETA1","status":"affected","lessThan":"v7.4.19","versionType":"git"},{"version":"v8.0.0-BETA1","status":"affected","lessThan":"v8.1.7","versionType":"git"}],"collectionURL":"https://packagist.org/packages/symfony/http-foundation","repo":"https://github.com/symfony/http-foundation","modules":["Symfony\\Component\\HttpFoundation\\HeaderUtils::split()"]}],"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"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/108xxx/CVE-2026-108082.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-108082","state":"PUBLISHED","datePublished":"2026-10-15T14:46:01.594Z","dateUpdated":"2026-10-15T18:04:45.913Z","assignerShortName":"Checkmarx","assignerOrgId":"596c5446-0ce5-4ba2-aa66-48b3b757a647","dateReserved":"2026-10-09T12:09:17.141Z"},"containers":{"cna":{"title":"Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header","descriptions":[{"lang":"en","value":"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 (?<!\\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."}],"affected":[{"vendor":"sensiolabs","product":"symfony","packageName":"symfony/http-foundation","defaultStatus":"unaffected","versions":[{"version":"v4.1.0-BETA1","status":"affected","lessThan":"v5.4.54","versionType":"git"},{"version":"v6.0.0-BETA1","status":"affected","lessThan":"v6.4.46","versionType":"git"},{"version":"v7.0.0-BETA1","status":"affected","lessThan":"v7.4.19","versionType":"git"},{"version":"v8.0.0-BETA1","status":"affected","lessThan":"v8.1.7","versionType":"git"}],"collectionURL":"https://packagist.org/packages/symfony/http-foundation","repo":"https://github.com/symfony/http-foundation","modules":["Symfony\\Component\\HttpFoundation\\HeaderUtils::split()"]}],"references":[{"url":"https://github.com/symfony/symfony/pull/66048","tags":["patch"]},{"url":"https://github.com/symfony/symfony/pull/66491","tags":["patch"]},{"url":"https://github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc","tags":["vendor-advisory"]},{"url":"https://symfony.com/blog/cve-2026-108082-redos-in-headerutils-split-reachable-through-the-cache-control-request-header","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333 Inefficient regular expression complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"Checkmarx","orgId":"596c5446-0ce5-4ba2-aa66-48b3b757a647","dateUpdated":"2026-10-15T15:32:05.788Z"},"datePublic":"2026-09-14T11:59:00.000Z","cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","versionStartIncluding":"v4.1.0-beta1","versionEndExcluding":"v5.4.54"},{"vulnerable":true,"criteria":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","versionStartIncluding":"v6.0.0-beta1","versionEndExcluding":"v6.4.46"},{"vulnerable":true,"criteria":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","versionStartIncluding":"v7.0.0-beta1","versionEndExcluding":"v7.4.19"},{"vulnerable":true,"criteria":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","versionStartIncluding":"v8.0.0-beta1","versionEndExcluding":"v8.1.7"}]}]}],"credits":[{"lang":"en","value":"r3verii","type":"finder"},{"lang":"en","value":"Duarte Santos","type":"other"},{"lang":"en","value":"Nicolas Grekas","type":"remediation developer"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-15T18:04:09.776300Z","id":"CVE-2026-108082","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-15T18:04:45.913Z"}}]}}}