Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Scriban versions before 6.6.0, and Scriban.Signed before 6.6.0, are vulnerable to a denial of service caused by deeply nested template expressions that overflow the parser's stack and crash the host process. An attacker who can supply template input to an application can trigger this without authentication, and the crash cannot be caught. Upgrade to version 6.6.0 or later. Applications that handle untrusted templates can also set the ExpressionDepthLimit parser option, which is disabled by default.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.7 | High | 4.0 | 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 | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0057, the 47th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:21 UTC First seen by agentprime
- 31 Oct 2026, 15:21 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-wgh7-7m3c-fx25
- OSV: GHSA-wgh7-7m3c-fx25
- github.com/scriban/scriban/security/advisories/GHSA-wgh7-7m3c-fx25
- github.com/scriban/scriban/commit/a6fe6074199e5c04f4d29dc8d8e652b24d33e3e4
- github.com/scriban/scriban/commit/b5ac4bf30459fdc76964e3f751e16f7e96079ea7
- github.com/scriban/scriban