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CVE-2026-109413

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.7 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • symfony

    Versions
    • ≥ 0, < v5.4.54: Affected (git)
    • ≥ v6.0.0-BETA1, < v6.4.45: Affected (git)
    • ≥ v7.0.0-BETA1, < v7.4.18: Affected (git)
    • ≥ v8.0.0-BETA1, < v8.1.6: Affected (git)

    Update to v5.4.54; Update to v6.4.45; Update to v7.4.18; Update to v8.1.6

  • symfony Debian:12

    Versions
    • 5.4.23+dfsg-1
    • 5.4.23+dfsg-1+deb12u1
    • 5.4.23+dfsg-1+deb12u2
    • 5.4.23+dfsg-1+deb12u3
    • 5.4.23+dfsg-1+deb12u4
    • 5.4.23+dfsg-1+deb12u5
    • 5.4.24+dfsg-1
    • 5.4.25+dfsg-1
    • 5.4.27+dfsg-1
    • 5.4.28+dfsg-1
    • 5.4.29+dfsg-1
    • 5.4.30+dfsg-1
    • 5.4.31+dfsg-1
    • 5.4.31+dfsg-2
    • 5.4.32+dfsg-1
    • 5.4.33+dfsg-1
    • 5.4.34+dfsg-1
    • 5.4.34+dfsg-2
    • 5.4.35+dfsg-1
    • 5.4.35+dfsg-2
    • 5.4.35+dfsg-3
    • 5.4.52+dfsg-0+deb12u1
    • 5.4.53+dfsg-0+deb12u1
    • 6.3.0+dfsg-1
    • 6.3.0~rc1+dfsg-1
    • 6.3.0~rc2+dfsg-1
    • 6.3.1+dfsg-1
    • 6.3.3+dfsg-1
    • 6.3.4+dfsg-1
    • 6.3.5+dfsg-1
    • 6.3.6+dfsg-1
    • 6.3.7+dfsg-1
    • 6.4.0+dfsg-1
    • 6.4.0~beta2+dfsg-1
    • 6.4.0~beta3+dfsg-1
    • 6.4.0~rc1+dfsg-1
    • 6.4.0~rc2+dfsg-1
    • 6.4.1+dfsg-1
    • 6.4.10+dfsg-1
    • 6.4.11+dfsg-1
    • 6.4.12+dfsg-1
    • 6.4.13+dfsg-1
    • 6.4.14+dfsg-1
    • 6.4.15+dfsg-1
    • 6.4.16+dfsg-1
    • 6.4.16+dfsg-2
    • 6.4.17+dfsg-1
    • 6.4.17+dfsg-2
    • 6.4.17+dfsg-3
    • 6.4.17+dfsg-4
    • 6.4.17+dfsg-5
    • 6.4.17+dfsg-6
    • 6.4.18+dfsg-1
    • 6.4.19+dfsg-1
    • 6.4.19+dfsg-2
    • 6.4.2+dfsg-1
    • 6.4.20+dfsg-1
    • 6.4.20+dfsg-2
    • 6.4.21+dfsg-1
    • 6.4.21+dfsg-2
    • 6.4.24+dfsg-1
    • 6.4.25+dfsg-1
    • 6.4.3+dfsg-1
    • 6.4.4+dfsg-1
    • 6.4.4+dfsg-2
    • 6.4.4+dfsg-3
    • 6.4.4+dfsg-4
    • 6.4.5+dfsg-1
    • 6.4.5+dfsg-2
    • 6.4.5+dfsg-3
    • 6.4.5+dfsg-4
    • 6.4.6+dfsg-1
    • 6.4.7+dfsg-1
    • 6.4.9+dfsg-1
    • 7.0.4+dfsg-1
    • 7.0.5+dfsg-1
    • 7.0.6+dfsg-1
    • 7.0.7+dfsg-1
    • 7.1.0~beta1+dfsg-1
    • 7.1.0~rc1+dfsg-1
    • 7.1.2+dfsg-1
    • 7.1.3+dfsg-1
    • 7.1.4+dfsg-1
    • 7.1.5+dfsg-1
    • 7.2.0~beta1+dfsg-1
    • 7.2.0~beta2+dfsg-1
    • 7.2.0~rc1+dfsg-1
    • 7.2.1+dfsg-1
    • 7.2.2+dfsg-1
    • 7.2.3+dfsg-1
    • 7.2.4+dfsg-1
    • 7.2.5+dfsg-1
    • 7.2.6-1
    • 7.3.0+dfsg-1
    • 7.3.0~beta1+dfsg-1
    • 7.3.0~beta2+dfsg-1
    • 7.3.0~rc1+dfsg-1
    • 7.3.1+dfsg-1
    • 7.3.2+dfsg-1
    • 7.3.3+dfsg-1
    • 7.3.4+dfsg-1
    • 7.3.5-1
    • 7.4.0+dfsg-1
    • 7.4.0+dfsg-2
    • 7.4.0~beta1-1
    • 7.4.0~beta1-2
    • 7.4.0~beta2+dfsg-1
    • 7.4.0~beta2+dfsg-2
    • 7.4.0~beta2+dfsg-3
    • 7.4.0~rc1+dfsg-1
    • 7.4.0~rc2+dfsg-1
    • 7.4.0~rc3+dfsg-1
    • 7.4.10+dfsg-1
    • 7.4.12+dfsg-1
    • 7.4.13+dfsg-1
    • 7.4.13+dfsg-2
    • 7.4.14+dfsg-1
    • 7.4.15+dfsg-1
    • 7.4.15+dfsg-2
    • 7.4.16+dfsg-1
    • 7.4.17+dfsg-1
    • 7.4.18+dfsg-1
    • 7.4.19+dfsg-1
    • 7.4.2+dfsg-1
    • 7.4.2+dfsg-2
    • 7.4.20+dfsg-1
    • 7.4.21+dfsg-1
    • 7.4.3+dfsg-1
    • 7.4.4+dfsg-1
    • 7.4.5+dfsg-1
    • 7.4.6+dfsg-1
    • 7.4.6+dfsg-2
    • 7.4.7+dfsg-1
    • 7.4.8+dfsg-1
    • 7.4.9+dfsg-1
    • 8.0.0+dfsg-1
    • 8.0.0~beta2+dfsg-1
    • 8.0.0~beta2+dfsg-2
    • 8.0.0~rc1+dfsg-1
    • 8.0.0~rc2+dfsg-1
    • 8.0.0~rc3+dfsg-1
    • 8.0.10-1
    • 8.0.11+dfsg-1
    • 8.0.12+dfsg-1
    • 8.0.13+dfsg-1
    • 8.0.2+dfsg-1
    • 8.0.3+dfsg-1
    • 8.0.4+dfsg-1
    • 8.0.5+dfsg-1
    • 8.0.6+dfsg-1
    • 8.0.7+dfsg-1
    • 8.0.8+dfsg-1
    • 8.0.9+dfsg-1
    • 8.1.0+dfsg-1
    • 8.1.1+dfsg-1
    • 8.1.3+dfsg-1
    • 8.1.4+dfsg-1
    • 8.1.5+dfsg-1
    • 8.1.6+dfsg-1
    • 8.1.7+dfsg-1
    • 8.1.8+dfsg-1
    • 8.1.9+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Debian:13

    Versions
    • 6.4.21+dfsg-2
    • 6.4.21+dfsg-2+deb13u1
    • 6.4.24+dfsg-1
    • 6.4.25+dfsg-1
    • 6.4.40+dfsg-0+deb13u1
    • 6.4.41+dfsg-0+deb13u1
    • 7.0.4+dfsg-1
    • 7.0.5+dfsg-1
    • 7.0.6+dfsg-1
    • 7.0.7+dfsg-1
    • 7.1.0~beta1+dfsg-1
    • 7.1.0~rc1+dfsg-1
    • 7.1.2+dfsg-1
    • 7.1.3+dfsg-1
    • 7.1.4+dfsg-1
    • 7.1.5+dfsg-1
    • 7.2.0~beta1+dfsg-1
    • 7.2.0~beta2+dfsg-1
    • 7.2.0~rc1+dfsg-1
    • 7.2.1+dfsg-1
    • 7.2.2+dfsg-1
    • 7.2.3+dfsg-1
    • 7.2.4+dfsg-1
    • 7.2.5+dfsg-1
    • 7.2.6-1
    • 7.3.0+dfsg-1
    • 7.3.0~beta1+dfsg-1
    • 7.3.0~beta2+dfsg-1
    • 7.3.0~rc1+dfsg-1
    • 7.3.1+dfsg-1
    • 7.3.2+dfsg-1
    • 7.3.3+dfsg-1
    • 7.3.4+dfsg-1
    • 7.3.5-1
    • 7.4.0+dfsg-1
    • 7.4.0+dfsg-2
    • 7.4.0~beta1-1
    • 7.4.0~beta1-2
    • 7.4.0~beta2+dfsg-1
    • 7.4.0~beta2+dfsg-2
    • 7.4.0~beta2+dfsg-3
    • 7.4.0~rc1+dfsg-1
    • 7.4.0~rc2+dfsg-1
    • 7.4.0~rc3+dfsg-1
    • 7.4.10+dfsg-1
    • 7.4.12+dfsg-1
    • 7.4.13+dfsg-1
    • 7.4.13+dfsg-2
    • 7.4.14+dfsg-1
    • 7.4.15+dfsg-1
    • 7.4.15+dfsg-2
    • 7.4.16+dfsg-1
    • 7.4.17+dfsg-1
    • 7.4.18+dfsg-1
    • 7.4.19+dfsg-1
    • 7.4.2+dfsg-1
    • 7.4.2+dfsg-2
    • 7.4.20+dfsg-1
    • 7.4.21+dfsg-1
    • 7.4.3+dfsg-1
    • 7.4.4+dfsg-1
    • 7.4.5+dfsg-1
    • 7.4.6+dfsg-1
    • 7.4.6+dfsg-2
    • 7.4.7+dfsg-1
    • 7.4.8+dfsg-1
    • 7.4.9+dfsg-1
    • 8.0.0+dfsg-1
    • 8.0.0~beta2+dfsg-1
    • 8.0.0~beta2+dfsg-2
    • 8.0.0~rc1+dfsg-1
    • 8.0.0~rc2+dfsg-1
    • 8.0.0~rc3+dfsg-1
    • 8.0.10-1
    • 8.0.11+dfsg-1
    • 8.0.12+dfsg-1
    • 8.0.13+dfsg-1
    • 8.0.2+dfsg-1
    • 8.0.3+dfsg-1
    • 8.0.4+dfsg-1
    • 8.0.5+dfsg-1
    • 8.0.6+dfsg-1
    • 8.0.7+dfsg-1
    • 8.0.8+dfsg-1
    • 8.0.9+dfsg-1
    • 8.1.0+dfsg-1
    • 8.1.1+dfsg-1
    • 8.1.3+dfsg-1
    • 8.1.4+dfsg-1
    • 8.1.5+dfsg-1
    • 8.1.6+dfsg-1
    • 8.1.7+dfsg-1
    • 8.1.8+dfsg-1
    • 8.1.9+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Debian:14

    Versions
    • 6.4.21+dfsg-2
    • 6.4.24+dfsg-1
    • 6.4.25+dfsg-1
    • 7.0.4+dfsg-1
    • 7.0.5+dfsg-1
    • 7.0.6+dfsg-1
    • 7.0.7+dfsg-1
    • 7.1.0~beta1+dfsg-1
    • 7.1.0~rc1+dfsg-1
    • 7.1.2+dfsg-1
    • 7.1.3+dfsg-1
    • 7.1.4+dfsg-1
    • 7.1.5+dfsg-1
    • 7.2.0~beta1+dfsg-1
    • 7.2.0~beta2+dfsg-1
    • 7.2.0~rc1+dfsg-1
    • 7.2.1+dfsg-1
    • 7.2.2+dfsg-1
    • 7.2.3+dfsg-1
    • 7.2.4+dfsg-1
    • 7.2.5+dfsg-1
    • 7.2.6-1
    • 7.3.0+dfsg-1
    • 7.3.0~beta1+dfsg-1
    • 7.3.0~beta2+dfsg-1
    • 7.3.0~rc1+dfsg-1
    • 7.3.1+dfsg-1
    • 7.3.2+dfsg-1
    • 7.3.3+dfsg-1
    • 7.3.4+dfsg-1
    • 7.3.5-1
    • 7.4.0+dfsg-1
    • 7.4.0+dfsg-2
    • 7.4.0~beta1-1
    • 7.4.0~beta1-2
    • 7.4.0~beta2+dfsg-1
    • 7.4.0~beta2+dfsg-2
    • 7.4.0~beta2+dfsg-3
    • 7.4.0~rc1+dfsg-1
    • 7.4.0~rc2+dfsg-1
    • 7.4.0~rc3+dfsg-1
    • 7.4.10+dfsg-1
    • 7.4.12+dfsg-1
    • 7.4.13+dfsg-1
    • 7.4.13+dfsg-2
    • 7.4.14+dfsg-1
    • 7.4.15+dfsg-1
    • 7.4.15+dfsg-2
    • 7.4.16+dfsg-1
    • 7.4.17+dfsg-1
    • 7.4.2+dfsg-1
    • 7.4.2+dfsg-2
    • 7.4.3+dfsg-1
    • 7.4.4+dfsg-1
    • 7.4.5+dfsg-1
    • 7.4.6+dfsg-1
    • 7.4.6+dfsg-2
    • 7.4.7+dfsg-1
    • 7.4.8+dfsg-1
    • 7.4.9+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 7.4.18+dfsg-1

    Update to 7.4.18+dfsg-1

  • symfony Ubuntu:16.04:LTS

    Versions
    • 2.7.1+dfsg-1
    • 2.7.5+dfsg-1
    • 2.7.9+dfsg-1
    • 2.7.9+dfsg-1ubuntu2
    • 2.7.10-0ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Ubuntu:Pro:18.04:LTS

    Versions
    • 2.8.7+dfsg-1.3ubuntu1
    • 3.4.3+dfsg-1ubuntu4
    • 3.4.6+dfsg-1
    • 3.4.6+dfsg-1ubuntu0.1
    • 3.4.6+dfsg-1ubuntu0.1+esm1
    • 3.4.6+dfsg-1ubuntu0.1+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Ubuntu:Pro:20.04:LTS

    Versions
    • 4.3.4+dfsg-1ubuntu1
    • 4.3.8+dfsg-1ubuntu1
    • 4.3.8+dfsg-1ubuntu1+esm1
    • 4.3.8+dfsg-1ubuntu1+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Ubuntu:Pro:22.04:LTS

    Versions
    • 5.2.6+dfsg-1ubuntu7
    • 5.4.4+dfsg-1ubuntu8
    • 5.4.4+dfsg-1ubuntu8+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Ubuntu:Pro:24.04:LTS

    Versions
    • 5.4.23+dfsg-1ubuntu1
    • 5.4.35+dfsg-3ubuntu1
    • 6.4.5+dfsg-3ubuntu2
    • 6.4.5+dfsg-3ubuntu3
    • 6.4.5+dfsg-3ubuntu3+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Ubuntu:26.10

    Versions
    • 7.4.7+dfsg-1ubuntu1
    • 7.4.9+dfsg-1ubuntu1
    • 7.4.13+dfsg-2ubuntu1
    • 7.4.14+dfsg-1ubuntu2
    • 7.4.15+dfsg-2ubuntu2
    • 7.4.16+dfsg-1ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • symfony Ubuntu:26.04:LTS

    Versions
    • 6.4.24+dfsg-1
    • 7.4.5+dfsg-1ubuntu1
    • 7.4.6+dfsg-2ubuntu1
    • 7.4.7+dfsg-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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