CVE-2026-108082
- Source
- https://cve.org/CVERecord?id=CVE-2026-108082
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108082.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-108082
- Aliases
-
- GHSA-r925-mgvr-h9cc
- Published
- 2026-10-15T14:46:01Z
- Modified
- 2026-10-16T02:47:29Z
- Severity
-
- 8.7 (High) CVSS_V4 - 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 CVSS Calculator
- Summary
- Symfony: ReDoS in HeaderUtils::split() Reachable Through the Cache-Control Request Header
- Details
-
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.
- Database specific
{ "cna_assigner": "Checkmarx", "cwe_ids": [ "CWE-1333" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108082.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "v4.1.0-BETA1" }, { "fixed": "v5.4.54" } ], "source": "AFFECTED_FIELD" } ] }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108082.json
- https://github.com/symfony/http-foundation
- https://github.com/symfony/symfony/pull/66048
- https://github.com/symfony/symfony/pull/66491
- https://github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc
- https://nvd.nist.gov/vuln/detail/CVE-2026-108082
- https://packagist.org/packages/symfony/http-foundation
- https://symfony.com/blog/cve-2026-108082-redos-in-headerutils-split-reachable-through-the-cache-control-request-header
Affected packages
Git / github.com/symfony/http-foundation
Affected ranges
- Type
- GIT
- Repo
- https://github.com/symfony/http-foundation
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "v6.0.0-BETA1" }, { "fixed": "v6.4.46" }, { "introduced": "v7.0.0-BETA1" }, { "fixed": "v7.4.19" }, { "introduced": "v8.0.0-BETA1" }, { "fixed": "v8.1.7" } ], "source": "AFFECTED_FIELD" }