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CVE-2026-109391— Square Squash through commit e73f280 Unauthenticated YAML Deserialization via Symbolication API

Quick assessment

Affected
Square Squash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Square Squash 在 e73f280 提交中包含一个不安全的反序列化漏洞，允许未认证的攻击者通过 POST /api/1.0/symbolication 端点存储精心构造的 YAML 数据。当引用由攻击者控制的符号化 UUID 的事件被符号化时，存储的值将被传递给 YAML.load 方法，并在 SafeYAML 以不安全模式下执行，从而导致任意 Ruby 对象反序列化及潜在代码执行。

CVSS 8.1 · High EPSS 0.48% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
Square Squash ≤ e73f2805f9eb30780a5c213b001f0f4255660fbf affected
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I. Basic Information for CVE-2026-109391

Vulnerability Information
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Vulnerability Title
Square Squash through commit e73f280 Unauthenticated YAML Deserialization via Symbolication API
Source: CVE Program / CVE List V5
Vulnerability Description
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 / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Square Squash 0 ~ e73f2805f9eb30780a5c213b001f0f4255660fbf -

II. Public POCs for CVE-2026-109391

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III. Intelligence Information for CVE-2026-109391

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Patches & Fixes for CVE-2026-109391 (3)

Vendor Advisories for CVE-2026-109391 (1)

Security Blog Posts for CVE-2026-109391 (1)

IV. Related Vulnerabilities

Same vendor: Square
Same weakness: CWE-502

V. Comments for CVE-2026-109391

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