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CVE-2026-87719— Deserialization of Untrusted Data in GitLab

Quick assessment

Affected
GitLab GitLab
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.

GitLab是美国GitLab公司开源的一款源代码管理平台。 GitLab EE 18.3至19.1.8之前版本、19.2至19.2.6之前版本和19.3至19.3.2之前版本存在反序列化注入漏洞，该漏洞源于使用特制GraphQL订阅参数绕过序列化并执行服务器对象查找，可能导致具有Duo Chat访问权限的已认证用户获取Advanced Search实例配置和敏感凭据。

CVSS 9.9 · Critical EPSS 0.57% · P47

Affected Version Matrix 5

VendorProduct Version RangeStatus
GitLab GitLab 18.3< 18.11.12 affected
19.0< 19.0.9 affected
19.1< 19.1.8 affected
19.2< 19.2.6 affected
19.3< 19.3.2 affected
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I. Basic Information for CVE-2026-87719

Vulnerability Information
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Vulnerability Title
Deserialization of Untrusted Data in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
Vulnerability Title
GitLab 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab是美国GitLab公司开源的一款源代码管理平台。 GitLab EE 18.3至19.1.8之前版本、19.2至19.2.6之前版本和19.3至19.3.2之前版本存在反序列化注入漏洞，该漏洞源于使用特制GraphQL订阅参数绕过序列化并执行服务器对象查找，可能导致具有Duo Chat访问权限的已认证用户获取Advanced Search实例配置和敏感凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 18.3 ~ 18.11.12 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-87719

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III. Intelligence Information for CVE-2026-87719

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Other References for CVE-2026-87719 (1)

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-502