Scriban up to 6.6.0 String Padding Functions string.pad_left/string.pad_right width denial of service

Summaryinfo

A vulnerability described as problematic has been identified in Scriban up to 6.6.0. Affected by this issue is the function string.pad_left/string.pad_right of the component String Padding Functions. Such manipulation of the argument width leads to denial of service. This vulnerability is uniquely identified as CVE-2026-74788. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Scriban up to 6.6.0 and classified as problematic. Affected by this issue is the function string.pad_left/string.pad_right of the component String Padding Functions. The manipulation of the argument width with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

Scriban before 7.0.0 (affected versions <= 6.6.0) contains an uncontrolled memory allocation vulnerability in the string.pad_left and string.pad_right template functions, which perform no validation on the width parameter before delegating to .NET's String.PadLeft/PadRight. When an application exposes Scriban to untrusted template input, an attacker can supply an arbitrarily large width value (e.g., 500,000,000) to trigger ~1GB memory allocations in a single call, resulting in OutOfMemoryException and denial of service. The TemplateContext.LimitToString limit does not prevent this because it is only enforced after the string has been fully allocated.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-74788 since 08/16/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 7.0.0 eliminates this vulnerability.

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Productinfo

Name

• Scriban

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6.0

Website

• Product: https://github.com/scriban/scriban/

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