GHSA-v66j-x4hw-fv9g
High · 7.5Scriban: Uncontrolled Memory Allocation via string.pad_left/pad_right Allows Remote Denial of Service
CVSS
7.5
EPSS
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Published
Mar 24, 2026
CISA due date
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The record
The built-in `string.pad_left` and `string.pad_right` template functions in Scriban perform no validation on the `width` parameter, allowing a template expression to allocate arbitrarily large strings in a single call. When Scriban is exposed to untrusted template input — as in the official Scriban.AppService playground deployed on Azure — an unauthenticated attacker can trigger ~1GB memory allocations with a 39-byte payload, crashing the service via `OutOfMemoryException`.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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