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/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.
CVE-2026-109391
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-109391
Squash
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/SquareSquash/web",
"vendor": "Square",
"product": "Squash",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "git",
"lessThanOrEqual": "e73f2805f9eb30780a5c213b001f0f4255660fbf"
}
],
"packageURL": "pkg:github/SquareSquash/web",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-109391
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #20497 · Revision 1
- Added to Heist Feed
- Publisher date