Resource exhaustion in Scriban
CVE-2026-74789
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Scriban — versions 0, 7.0.0
Weakness classification (CWE)
References
- github.com/scriban/scriban/security/advisories/GHSA-c875-h985-hvrc (vendor-advisory)
- www.vulncheck.com/advisories/scriban-before-looplimit-bypass-via-built-in-opera… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74789?
- CVE-2026-74789 is a high-severity vulnerability in Scriban, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-16.
- How severe is CVE-2026-74789?
- High severity. CVSS v3 base score is 7.5 out of 10.