CVE-2026-108082

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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.", "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). 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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.", "supportingMedia": [{"type": "text/html", "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>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1333", "description": "CWE-1333 Inefficient regular expression complexity"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v5.4.54", "versionStartIncluding": "v4.1.0-beta1"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v6.4.46", "versionStartIncluding": "v6.0.0-beta1"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v7.4.19", "versionStartIncluding": "v7.0.0-beta1"}, {"criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "v8.1.7", "versionStartIncluding": "v8.0.0-beta1"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "shortName": "Checkmarx", "dateUpdated": "2026-10-15T15:32:05.788Z"}}}, "cveMetadata": {"cveId": "CVE-2026-108082", "state": "PUBLISHED", "dateUpdated": "2026-10-15T18:04:45.913Z", "dateReserved": "2026-10-09T12:09:17.141Z", "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "datePublished": "2026-10-15T14:46:01.594Z", "assignerShortName": "Checkmarx"}, "dataVersion": "5.2"}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v4.1.0-BETA1,v5.4.54)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v6.0.0-BETA1,v6.4.46)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v7.0.0-BETA1,v7.4.19)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v8.0.0-BETA1,v8.1.7)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "symfony", "source": "cna", "vendor": "sensiolabs"}, "product": "symfony", "vendor": "sensiolabs"}], "created": "2026-10-16T20:45:16.957370+00:00", "updated": "2026-10-17T10:15:06.893360+00:00", "vendors": ["sensiolabs", "sensiolabs$PRODUCT$symfony"]}