CVE-2026-109413
- Source
- https://cve.org/CVERecord?id=CVE-2026-109413
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109413.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-109413
- Aliases
-
- GHSA-2v3c-qxhr-7vpv
- Published
- 2026-10-15T14:57:00Z
- Modified
- 2026-10-16T02:47:44Z
- 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: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process
- Details
-
In Symfony YAML prior to versions 5.4.54, 6.4.45, 7.4.18, and 8.1.6, Yaml\Parser::lexInlineStructure() recursed through lexInlineMapping() and lexInlineSequence() for every { and [ of an inline collection, without entering the nesting level that the rest of the parser bounds with maxNestingLevel. A document made of deeply nested inline collections, such as [[[[...]]]], exhausted the stack while it was being lexed: depending on the PHP version and its stack settings, the process crashed or the request ended with a fatal error.
Any code parsing untrusted YAML is affected. That includes #[MapRequestPayload] when the Yaml component is installed and the endpoint does not restrict acceptFormat: a single unauthenticated request with a YAML content type is enough.
This issue affects symfony/yaml through v5.4.53, v6.0.0-BETA1 through v6.4.44, v7.0.0-BETA1 through v7.4.17, and v8.0.0-BETA1 through v8.1.5.
- Database specific
{ "cna_assigner": "Checkmarx", "cwe_ids": [ "CWE-674" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109413.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109413.json
- https://github.com/symfony/symfony/pull/65688
- https://github.com/symfony/symfony/security/advisories/GHSA-2v3c-qxhr-7vpv
- https://github.com/symfony/yaml
- https://nvd.nist.gov/vuln/detail/CVE-2026-109413
- https://packagist.org/packages/symfony/yaml
- https://symfony.com/blog/cve-2026-109413-unbounded-recursion-in-the-yaml-inline-lexer-lets-a-single-document-crash-the-process
Affected packages
Git / github.com/symfony/yaml
Affected ranges
- Type
- GIT
- Repo
- https://github.com/symfony/yaml
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedIntroducedFixedIntroducedFixedIntroducedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "0" }, { "fixed": "v5.4.54" }, { "introduced": "v6.0.0-BETA1" }, { "fixed": "v6.4.45" }, { "introduced": "v7.0.0-BETA1" }, { "fixed": "v7.4.18" }, { "introduced": "v8.0.0-BETA1" }, { "fixed": "v8.1.6" } ], "source": "AFFECTED_FIELD" }