CVE-2026-109391 — Square Squash through commit e73f280 Unauthenticated YAML Deserialization via Symbolication API
Square Squash through commit e73f280 contains an insecure deserialization vulnerability that allows unauthenticated attackers to store crafted YAML via the POST /api/1.0/symboli…
Published: 2026-10-12 · CVSS: 9.2 · CVSS 4.0
Square Squash through commit e73f280 contains an insecure deserialization vulnerability that allows unauthenticated attackers to store crafted YAML via the POST /api/1.0/symbolication endpoint. When occurrences referencing the attacker-controlled symbolication UUID are symbolicated, the stored values are passed to YAML.load with SafeYAML in unsafe mode, enabling arbitrary Ruby object deserialization and potential code execution.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7