CVE-2026-108082
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
In Symfony http-foundation 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 before a separator could be divided among iterations in exponentially many ways, causing high CPU usage. HeaderBag calls it for the Cache-Control header whenever a Request is built, so any application handling HTTP requests is reachable without authentication. From 18 spaces on, preg_match_all() gives up at pcre.backtrack_limit and split() returns an empty array, silently dropping every directive of the header.
Risk Assessment
A single request with such a header costs close to a second of CPU, enabling unauthenticated denial of service. Additionally, from 18 spaces on, header directives are silently dropped, which may lead to unexpected application behavior.
Recommendation
Update symfony/http-foundation to version 5.4.54, 6.4.46, 7.4.19, or 8.1.7 (or later). Consider limiting header size and content at the proxy or WAF level.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

