CVE-2026-74789 Scriban before 7.0.0 LoopLimit Bypass via Built-in Operations
Attackers can cause denial of service in applications using Scriban by bypassing LoopLimit via expensive built-in operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-74789?
CVE-2026-74789 is a high-severity denial of service vulnerability in scriban, published on 16 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Scriban before 7.0.0 (affected <= 6.6.0) applies its LoopLimit constraint only to script loop statements and not to expensive iteration performed inside built-in operators and functions. As a result, a single expression such as {{ 1..1000000 | array.size }} — or a memory-amplification expression such as {{ 'A' * 200000000 }} — can force large CPU or memory consumption even when LoopLimit is configured to a very small value, resulting in denial of service. Applications that render attacker-controlled templates and rely on LoopLimit for safe execution are affected.
Weakness: CWE-400
Which versions are affected by CVE-2026-74789?
4 open source packages ship an affected version, including Scriban.Signed and scriban.
| Package | Affected | Fixed in |
|---|---|---|
Scriban.Signed NuGet | All versions | 7.0.0 |
Scriban.Signed NuGet | All versions | 7.0.0 |
scriban NuGet | All versions | 7.0.0 |
scriban NuGet | All versions | 7.0.0 |
How do I fix CVE-2026-74789?
Upgrade Scriban.Signed to 7.0.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-74789 being exploited?
There is no known exploitation of CVE-2026-74789 in the wild and no public exploit code.
Sources
Also known as GHSA-5vwr-vwx4-9hc3, GHSA-c875-h985-hvrc.