Vulnerability in sensiolabs symfony

[ Description ]Official 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. 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.

[ Fixes ]Fixes and patches

• Security bulletin: Symfony GHSA-2v3c-qxhr-7vpvVendor patch or bulletin · CERT-FR · github.com/symfony/symfony/security/advisories/GHSA-2v3c-qxhr-7vpv, cited by CERT-FR CERTFR-2026-AVI-1324
• Security bulletin: Symfony GHSA-r925-mgvr-h9ccVendor patch or bulletin · CERT-FR · github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc, cited by CERT-FR CERTFR-2026-AVI-1324
• Security bulletin: Symfony GHSA-7rpj-w9pf-39rrVendor patch or bulletin · CERT-FR · github.com/symfony/symfony/security/advisories/GHSA-7rpj-w9pf-39rr, cited by CERT-FR CERTFR-2026-AVI-1324

[ Advisories ]Government CERT advisories

• BSI CERT-Bund19 Oct 2026WID-SEC-2026-4047

  Snipe-IT: Multiple vulnerabilities Translated from German

  CVE-2026-109413CVE-2026-55599CVE-2026-45073+9 more CVEs
• CERT-FR15 Oct 2026CERTFR-2026-AVI-1324

  Multiple vulnerabilities in Symfony products Translated from French

  Multiple vulnerabilities have been discovered in Symfony products. They allow an attacker to cause remote denial of service.

  CVE-2026-109449CVE-2026-108082CVE-2026-109413

[ References ]References

• github.com/symfony/symfony/pull/66048
• github.com/symfony/symfony/pull/66491
• github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc
• symfony.com/blog/cve-2026-108082-redos-in-headerutils-split-reachable-through-the-cache…