{"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 (?<!\\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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to versions&nbsp;<span>5.4.54,&nbsp;</span><span>6.4.46,&nbsp;</span><span>7.4.19, and&nbsp;</span><span>8.1.7,&nbsp;</span><code>HeaderUtils::split()</code><span> parsed header values with a pattern whose token alternative also matched whitespace, followed by a </span><code>(?&lt;!\\s)</code><span> 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. </span><code>HeaderBag</code><span> calls it for the </span><code>Cache-Control</code><span> header whenever a </span><code>Request</code><span> is built, so any application handling HTTP requests is reachable, with no authentication.</span></p><p>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, <code>preg_match_all()</code> gives up at <code>pcre.backtrack_limit</code> and <code>split()</code> returns an empty array, so every directive of the header is silently dropped.</p><p>This issue affects <code>symfony/http-foundation</code>&nbsp;v4.1.0-BETA1 through v5.4.53, v6.0.0-BETA1 through&nbsp;v6.4.45, v7.0.0-BETA1 through&nbsp;v7.4.18, and v8.0.0-BETA1 through&nbsp;v8.1.6.</p>"}]}],"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"}}]}}