Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process

Description 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 ...,...

EUVD-2026-102109

Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process...

Linux Distros Unpatched Vulnerability : CVE-2026-109413

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

UBUNTU-CVE-2026-109413

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 documen...

Uncontrolled Recursion

Overview symfony/symfony is a PHP framework for web applications and a set of reusable PHP components. Affected versions of this package are vulnerable to Uncontrolled Recursion via Parser::lexInlineStructure, which recurses through lexInlineMapping and lexInlineSequence without incrementing the...

Uncontrolled Recursion

Overview Affected versions of this package are vulnerable to Uncontrolled Recursion via Parser::lexInlineStructure, which recurses through lexInlineMapping and lexInlineSequence without incrementing the shared nesting-level counter that guards against excessive depth. Because the maxNestingLevel...

CVE-2026-109413

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 documen...

DEBIAN-CVE-2026-109413

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 documen...

CVE-2026-109413

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 documen...

CVE-2026-109413

The symfony/yaml component is vulnerable to a denial of service (DoS) condition due to unbounded recursion in the Yaml eParser::lexInlineStructure() function. The root cause is that the lexer recurses through lexInlineMapping() and lexInlineSequence() for every { and [ character in an inline coll...

CVE-2026-109413 Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process

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 documen...

CVE-2026-109413 Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process

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 documen...

CVE-2026-109413 Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process

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 documen...

CVE-2026-109413

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 documen...

CVE-2026-109413

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 documen...

CVE-2026-109413: Uncontrolled Recursion

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 documen...

PT-2026-114952

Name of the Vulnerable Software and Affected Versions symfony/yaml versions 5.4.0 through 5.4.53 symfony/yaml versions 6.0.0-BETA1 through 6.4.44 symfony/yaml versions 7.0.0-BETA1 through 7.4.17 symfony/yaml versions 8.0.0-BETA1 through 8.1.5 Description The YamlParser::lexInlineStructure functio...