Sensiolabs

CVE-2026-123792: The Symfony Yaml components Inline and Parser, parse some YAML documents inefficiently, so that a small crafted document can take disproportionately long to pro

CVE-2026-123792 Nov 6, 2026 Source: Vendor

The Symfony Yaml components Inline and Parser, parse some YAML documents inefficiently, so that a small crafted document can take disproportionately long to process, keeping a PHP process busy for seconds or minutes, potentially causing a denial of service in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.

The parser repeats work it has already done in several places. An embedded mapping in a flow sequence is parsed again for every scalar app

Source of record The credited names below are quoted verbatim from the vendor's own advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-123792

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CVE-2026-123792 BR2026-0000-043016 unclaimed

Credited as Sebastian Bergmann