CVE-2026-74785 scriban CVE debrief

Who should care

Developers and administrators using Scriban for template rendering should be aware of these vulnerabilities and take steps to mitigate the risk. This includes assessing their exposure to affected versions, prioritizing patching, and considering compensating controls to limit template supply chain risk. Security teams and vulnerability management teams should also review the official Scriban security advisory and monitor for unusual activity or errors in Scriban that may indicate exploitation attempts.

Technical summary

Scriban before 7.0.0 contains three distinct denial-of-service vulnerabilities in expression evaluation that bypass existing safety controls through unbounded string multiplication, uncontrolled BigInteger shift operations, and LoopLimit bypass via range enumeration in builtin functions. These vulnerabilities can be triggered by attackers who can supply templates, potentially causing out-of-memory exceptions or CPU exhaustion and typically terminating the entire host process. Organizations using Scriban for template rendering should prioritize patching to prevent potential denial-of-service attacks.

Defensive priority

Organizations using Scriban should prioritize patching to prevent potential denial-of-service attacks.

Recommended defensive actions

• Inventory and assess Scriban usage in your environment.
• Apply the patch to upgrade to Scriban version 7.0.0 or later.
• Monitor for unusual activity or errors in Scriban.
• Consider implementing compensating controls to limit template supply chain risk.
• Review the official Scriban security advisory.
• Track exceptions and retest remediated assets.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE description notes Scriban before 7.0.0 contains three distinct denial-of-service vulnerabilities in expression evaluation. Attackers who can supply templates can cause out-of-memory exceptions or CPU exhaustion, typically terminating the entire host process. To verify and mitigate this vulnerability, defenders should review the official Scriban security advisory and assess their exposure to affected versions. They should also consider implementing compensating controls to limit template supply chain risk while patching is in progress.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.