CVE-2026-74785
Received Received - Intake

Scriban Template Engine DoS via Expression Evaluation Flaws

Publication date: 2026-08-16

Last updated on: 2026-08-16

Assigner: VulnCheck

Description
Scriban before 7.0.0 contains three distinct denial-of-service vulnerabilities in expression evaluation that bypass existing safety controls through unbounded string multiplication, uncontrolled BigInteger shift operations, and LoopLimit bypass via range enumeration in builtin functions. Attackers who can supply templates can cause out-of-memory exceptions or CPU exhaustion, typically terminating the entire host process.

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Meta Information

Published
2026-08-16
Last Modified
2026-08-16
Generated
2026-08-16
AI Q&A
2026-08-16
EPSS Evaluated
N/A
NVD
CVE-2026-74785
EUVD
EUVD-2026-59951

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
scriban scriban to 7.0.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

CVE-2026-74785 is a Denial of Service (DoS) vulnerability in Scriban versions before 7.0.0. It allows attackers who can supply templates to cause out-of-memory exceptions or CPU exhaustion by exploiting unbounded string multiplication, uncontrolled BigInteger shift operations, and LoopLimit bypass via range enumeration in built-in functions.

Detection Guidance

Detecting this vulnerability requires checking if Scriban versions before 7.0.0 are installed or used in your system. Review template files for excessive string multiplication, large BigInteger shifts, or unbounded range enumerations. Monitor for high CPU or memory usage during template processing.

Impact Analysis

If exploited, this vulnerability can crash applications or terminate the entire host process due to excessive memory consumption or CPU usage. Attackers could degrade system performance or make services unavailable by providing malicious templates.

Compliance Impact

This vulnerability primarily causes denial-of-service conditions through unbounded resource consumption, which may lead to application crashes or severe performance degradation. While it does not directly expose or leak data, prolonged downtime or service unavailability could impact compliance with regulations like GDPR (data processing integrity) or HIPAA (system availability requirements) if critical systems are affected.

Mitigation Strategies

Upgrade Scriban to version 7.0.0 or later immediately. If upgrading is not possible, restrict template input sources to trusted users only. Implement runtime monitoring for abnormal CPU or memory usage during template processing.

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