Scriban up to 6.5.x Parser recursion

Summaryinfo

A vulnerability classified as problematic has been found in Scriban up to 6.5.x. Affected is an unknown function of the component Parser. This manipulation causes recursion. The identification of this vulnerability is CVE-2026-74795. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Scriban up to 6.5.x. Affected by this vulnerability is some unknown processing of the component Parser. The manipulation with an unknown input leads to a recursion vulnerability. The CWE definition for the vulnerability is CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-74795 since 08/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 6.6.0 eliminates this vulnerability.

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Productinfo

Name

• Scriban

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5

Website

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

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