CVE-2026-109413
Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process
En bref
- Source
- NVD
- EPSS
- EPSS 0.40 % · centile 34 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- Checkmarx
- Statut NVD
- Awaiting Analysis
Description
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.
Faiblesses (CWE)
- CWE-674 — Récursion non maîtrisée
Références
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 4.0 | HIGH 8.7 | 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 | Checkmarx |
| CVSS 4.0 | HIGH 8.7 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · 596c5446-0ce5-4ba2-aa66-48b3b757a647 (Secondary) |
Avis
- GHSA-2v3c-qxhr-7vpv — Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process
Références européennes
- ENISA EUVD · EUVD-2026-102109
- GCVE · GCVE-0-2026-109413
Avis du CERT-FR
- CERTFR-2026-AVI-1324 — Multiples vulnérabilités dans les produits Symfony · cert.ssi.gouv.fr
Produits affectés
| Produit | Versions |
|---|---|
| sensiolabs · symfony | affected 0 < v5.4.54 ; affected v6.0.0-BETA1 < v6.4.45 ; affected v7.0.0-BETA1 < v7.4.18 ; affected v8.0.0-BETA1 < v8.1.6 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |