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Not in CISA KEV
HIGH severity

CVE-2026-124439 — Scriban

HIGH

CVE-2026-124439 is a high-severity (CVSS 7.5) CWE-674 vulnerability in scriban scriban. A fix is available — see the affected versions and patch details below.

Scriban and Scriban.Signed before 7.5.3 contain uncontrolled recursion flaws in which postfix member, indexer, and call chains bypass ExpressionDepthLimit, array comparison lacks depth…

Published
Updated
Affected
2 products
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

Scriban and Scriban.Signed before 7.5.3 contain uncontrolled recursion flaws in which postfix member, indexer, and call chains bypass ExpressionDepthLimit, array comparison lacks depth and cycle checks, and object.eval bypasses RecursiveLimit. Attackers who can supply templates can trigger an uncatchable StackOverflowException that terminates the host process.

Affected Products

2 products · 2 configurations
Application
scribanscriban
< 7.5.3
1 version
0
Application
scribanscriban
< 7.5.3
1 version
0

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every scriban scriban deployment and check each version against the affected-products list above.

  2. Fix

    Apply the scriban scriban security patch or hotfix for CVE-2026-124439 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Scriban and Scriban.Signed before 7.5.3 contain uncontrolled recursion flaws in which postfix member, indexer, and call chains bypass ExpressionDepthLimit, array comparison lacks depth and cycle checks, and object.eval bypasses RecursiveLimit. Attackers who can supply templates can trigger an uncatchable StackOverflowException that terminates the host process.
O3 Security · Runtime Protection

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