{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-108082", "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "state": "PUBLISHED", "assignerShortName": "Checkmarx", "dateReserved": "2026-10-09T12:09:17.141Z", "datePublished": "2026-10-15T14:46:01.594Z", "dateUpdated": "2026-10-15T18:04:45.913Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "shortName": "Checkmarx", "dateUpdated": "2026-10-15T15:32:05.788Z" }, "title": "Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header", "datePublic": "2026-09-14T11:59:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-1333", "description": "CWE-1333 Inefficient regular expression complexity", "type": "CWE" } ] } ], "affected": [ { "vendor": "sensiolabs", "product": "symfony", "collectionURL": "https://packagist.org/packages/symfony/http-foundation", "packageName": "symfony/http-foundation", "repo": "https://github.com/symfony/http-foundation", "modules": [ "Symfony\\Component\\HttpFoundation\\HeaderUtils::split()" ], "versions": [ { "status": "affected", "version": "v4.1.0-BETA1", "lessThan": "v5.4.54", "versionType": "git" }, { "status": "affected", "version": "v6.0.0-BETA1", "lessThan": "v6.4.46", "versionType": "git" }, { "status": "affected", "version": "v7.0.0-BETA1", "lessThan": "v7.4.19", "versionType": "git" }, { "status": "affected", "version": "v8.0.0-BETA1", "lessThan": "v8.1.7", "versionType": "git" } ], "defaultStatus": "unaffected" } ], "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" } ] } ] } ], "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 (?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.

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.

" } ] } ], "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" } } ], "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": [ { "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" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T18:04:45.913Z" } } ] } }