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CVE-2026-74795— Scriban before 6.6.0 Denial of Service via Uncontrolled Recursion

CVSS 7.5 · High EPSS 0.32% · P25

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
scribanscriban< 6.6.0affected
6.6.0unaffected
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I. Basic Information for CVE-2026-74795

Vulnerability Information
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Vulnerability Title
Scriban before 6.6.0 Denial of Service via Uncontrolled Recursion
Source: CVE Program / CVE List V5
Vulnerability Description
Scriban before 6.6.0 contains an uncontrolled recursion vulnerability in its recursive-descent parser. The parser does not enforce a default expression depth limit (the ExpressionDepthLimit property in ParserOptions defaults to null/disabled), so an attacker who controls template input can supply a deeply nested template (e.g., thousands of nested parentheses or blocks) that exhausts thread stack space and raises a StackOverflowException. Because a StackOverflowException cannot be caught in .NET, this causes immediate, unrecoverable termination of the hosting process, resulting in a denial of service. Applications that process untrusted or user-supplied templates can be exploited remotely without authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
scriban 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
scriban是scriban组织的一款高性能的文本模板引擎。 scriban 6.6.0之前版本存在资源管理错误漏洞，该漏洞源于递归下降解析器存在不受控制的递归问题，未强制执行表达式深度限制，攻击者可通过提供深度嵌套的模板耗尽线程栈空间，造成拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
scribanscriban 0 ~ 6.6.0 -

II. Public POCs for CVE-2026-74795

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Reproduced successfully in a real sandbox· Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker:VULNERABLE: uncatchable StackOverflowException killed the .NET process parsing deeply nested template (exit code 134) - DoS confirmed
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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III. Intelligence Information for CVE-2026-74795

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Vendor Advisories for CVE-2026-74795 (2)

Same Patch Batch · scriban · 2026-08-16 · 15 CVEs total

CVE-2026-730619.8 CRITICALScriban before 7.2.2 Arbitrary Property Write via TypedObjectAccessor
CVE-2026-747909.1 CRITICALScriban before 7.0.0 MemberFilter Bypass via TemplateContext Cache
CVE-2026-747848.7 HIGHScriban before 7.2.0 Denial of Service via array.insert_at
CVE-2026-747918.6 HIGHScriban before 7.0.0 Authorization Bypass via Stale Include Cache
CVE-2026-747927.5 HIGHScriban before 7.0.0 Stack Overflow via nested array initializers
CVE-2026-747837.5 HIGHScriban 6.6.0 through 7.2.0 Parser Recursion Denial of Service
CVE-2026-747887.5 HIGHScriban before 7.0.0 Denial of Service via string.pad_left/pad_right
CVE-2026-747877.5 HIGHScriban before 7.0.0 Uncontrolled Recursion via object.to_json
CVE-2026-747947.5 HIGHScriban before 6.6.0 Denial of Service via Infinite Recursion
CVE-2026-747897.5 HIGHScriban before 7.0.0 LoopLimit Bypass via Built-in Operations
CVE-2026-730627.5 HIGHScriban 3.0.0 through 7.2.0 Denial of Service via Array Multiplication
CVE-2026-730607.5 HIGHScriban 3.0.0 through 7.2.5 Denial of Service via ScriptRange.Multiply
CVE-2026-747856.5 MEDIUMScriban before 7.0.0 Denial of Service via Unbounded Resource Consumption
CVE-2026-747866.5 MEDIUMScriban before 7.0.0 Denial of Service via Unbounded Template Output

IV. Related Vulnerabilities

Same product: scriban
Same vendor: scriban
Same weakness: CWE-674

V. Comments for CVE-2026-74795

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