Vulnerability in Scriban
CVE-2026-74795
Scriban before 6.6.0 contains an uncontrolled recursion vulnerability in its recursive-descent parser. The parser does not enforce a default expression depth limit (the ExpressionDepthLimit property in ParserOptions defaults to null/disabled), so an attacker who controls template input can supply a deeply nested template (e.g., thousands of nested parentheses or blocks) that exhausts thread stack space and raises a StackOverflowException. Because a StackOverflowException cannot be caught in .NET, this causes immediate, unrecoverable termination of the hosting process, resulting in a denial of service. Applications that process untrusted or user-supplied templates can be exploited remotely without authentication.
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 (45.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.4% 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, 6.6.0
Weakness classification (CWE)
References
- github.com/scriban/scriban/security/advisories/GHSA-wgh7-7m3c-fx25 (vendor-advisory)
- www.vulncheck.com/advisories/scriban-before-denial-of-service-via-uncontrolled-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74795?
- CVE-2026-74795 is a high-severity vulnerability in Scriban, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-08-16.
- How severe is CVE-2026-74795?
- High severity. CVSS v3 base score is 7.5 out of 10.