vulnerability / NVI-00017769 / Revision 1
Scriban has a Stack Overflow via Nested Array Initializers That Bypass the ExpressionDepthLimit Fix
GitHub lists this reviewed advisory for Scriban, Scriban.Signed. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.5 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
Scriban
source listed< 7.0.0
### Summary StackOverflowException via nested array initializers bypasses ExpressionDepthLimit fix (GHSA-wgh7-7m3c-fx25) ### Details The recent fix for GHSA-wgh7-7m3c-fx25 (uncontrolled recursion in parser) added `ExpressionDepthLimit` defaulting to 250. However, deeply nested **array initializers** (`[[[[...`) recurse through `ParseArrayInitializer` → `ParseExpression` → `ParseArrayInitializer`, which is a **different recursion path** not covered by the expression depth counter. This causes a `StackOverflowException` on current main (commit b5ac4bf - "Add limits for default safety"). ### PoC ``` using Scriban; // ExpressionDepthLimit (default 250) does NOT prevent this crash string nested = "{{ " + new string('[', 5000) + "1" + new string(']', 5000) + " }}"; Template.Parse(nested); // StackOverflowException - process terminates ``` ### Impact Same as GHSA-wgh7-7m3c-fx25: High severity. StackOverflowException cannot be caught with try/catch in .NET - the process terminates immediately. Any application calling Template.Parse with untrusted input is vulnerable, even with the new default ExpressionDepthLimit enabled.
Scriban.Signed
source listed< 7.0.0
### Summary StackOverflowException via nested array initializers bypasses ExpressionDepthLimit fix (GHSA-wgh7-7m3c-fx25) ### Details The recent fix for GHSA-wgh7-7m3c-fx25 (uncontrolled recursion in parser) added `ExpressionDepthLimit` defaulting to 250. However, deeply nested **array initializers** (`[[[[...`) recurse through `ParseArrayInitializer` → `ParseExpression` → `ParseArrayInitializer`, which is a **different recursion path** not covered by the expression depth counter. This causes a `StackOverflowException` on current main (commit b5ac4bf - "Add limits for default safety"). ### PoC ``` using Scriban; // ExpressionDepthLimit (default 250) does NOT prevent this crash string nested = "{{ " + new string('[', 5000) + "1" + new string(']', 5000) + " }}"; Template.Parse(nested); // StackOverflowException - process terminates ``` ### Impact Same as GHSA-wgh7-7m3c-fx25: High severity. StackOverflowException cannot be caught with try/catch in .NET - the process terminates immediately. Any application calling Template.Parse with untrusted input is vulnerable, even with the new default ExpressionDepthLimit enabled.
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-p6q4-fgr8-vx4p ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.