CVE-2026-74788

Summary

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.

Affected Software

Weaknesses

• CWE-770: Allocation of Resources Without Limits or Throttling

References

• 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

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