CVE-2026-74788

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.

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Publisher and database URLs for this record (shown for attribution; reading stays in Bugflare).

• https://github.com/scriban/scriban/security/advisories/GHSA-v66j-x4hw-fv9g
• https://www.vulncheck.com/advisories/scriban-before-denial-of-service-via-string-pad-left-pad-right