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CVE-2026-74786— Scriban before 7.0.0 Denial of Service via Unbounded Template Output

Quick assessment

Affected
scriban scriban
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.

scriban是scriban组织的一款高性能的文本模板引擎。 scriban 6.6.0及之前版本存在资源管理错误漏洞，该漏洞源于LimitToString安全限制（默认1MB）可被绕过，由于ObjectToString在每次顶层调用时重置长度计数器且StringBuilderOutput未设置累计输出大小限制，可能导致攻击者通过提供模板循环渲染接近限制的字符串，分配约1GB内存，导致内存不足崩溃。

CVSS 6.5 · Medium EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
scriban scriban < 7.0.0 affected
7.0.0 unaffected
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I. Basic Information for CVE-2026-74786

Vulnerability Information
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Vulnerability Title
Scriban before 7.0.0 Denial of Service via Unbounded Template Output
Source: CVE Program / CVE List V5
Vulnerability Description
Scriban before 7.0.0 (affected versions <= 6.6.0) contains a denial-of-service vulnerability in which the LimitToString safety limit (default 1MB) can be bypassed because ObjectToString resets the per-call length counter (_currentToStringLength) on every top-level call and StringBuilderOutput enforces no cumulative output-size limit. An attacker who can supply a template can render a near-limit string repeatedly in a loop, allocating approximately 1GB of memory and causing an out-of-memory condition that crashes the host application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
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及之前版本存在资源管理错误漏洞，该漏洞源于LimitToString安全限制（默认1MB）可被绕过，由于ObjectToString在每次顶层调用时重置长度计数器且StringBuilderOutput未设置累计输出大小限制，可能导致攻击者通过提供模板循环渲染接近限制的字符串，分配约1GB内存，导致内存不足崩溃。
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
scriban scriban 0 ~ 7.0.0 -

II. Public POCs for CVE-2026-74786

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III. Intelligence Information for CVE-2026-74786

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Vendor Advisories for CVE-2026-74786 (2)

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

CVE-2026-73061 9.8 CRITICAL Scriban before 7.2.2 Arbitrary Property Write via TypedObjectAccessor
CVE-2026-74790 9.1 CRITICAL Scriban before 7.0.0 MemberFilter Bypass via TemplateContext Cache
CVE-2026-74784 8.7 HIGH Scriban before 7.2.0 Denial of Service via array.insert_at
CVE-2026-74791 8.6 HIGH Scriban before 7.0.0 Authorization Bypass via Stale Include Cache
CVE-2026-74792 7.5 HIGH Scriban before 7.0.0 Stack Overflow via nested array initializers
CVE-2026-74783 7.5 HIGH Scriban 6.6.0 through 7.2.0 Parser Recursion Denial of Service
CVE-2026-74788 7.5 HIGH Scriban before 7.0.0 Denial of Service via string.pad_left/pad_right
CVE-2026-74795 7.5 HIGH Scriban before 6.6.0 Denial of Service via Uncontrolled Recursion
CVE-2026-74787 7.5 HIGH Scriban before 7.0.0 Uncontrolled Recursion via object.to_json
CVE-2026-74794 7.5 HIGH Scriban before 6.6.0 Denial of Service via Infinite Recursion
CVE-2026-74789 7.5 HIGH Scriban before 7.0.0 LoopLimit Bypass via Built-in Operations
CVE-2026-73062 7.5 HIGH Scriban 3.0.0 through 7.2.0 Denial of Service via Array Multiplication
CVE-2026-73060 7.5 HIGH Scriban 3.0.0 through 7.2.5 Denial of Service via ScriptRange.Multiply
CVE-2026-74785 6.5 MEDIUM Scriban before 7.0.0 Denial of Service via Unbounded Resource Consumption

IV. Related Vulnerabilities

Same product: scriban
Same vendor: scriban
Same weakness: CWE-770

V. Comments for CVE-2026-74786

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