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TI-2026-52559 Aliases CVE-2026-74795GHSA-x4hp-vj3w-6w2m

Scriban before 6.6.0 Denial of Service via Uncontrolled Recursion

Priority MEDIUM 44CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-674.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00575 47th percentileScored 2026-11-07
Fix Fixed scriban (scriban): 6.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
scribanscribanbefore 6.6.06.6.0Patch availableCNA
  • scriban Vendorscriban Affected before 6.6.0 Fixed in 6.6.0 Patch available CNA

Remediation

  • Fix · CNA scriban (scriban) Fixed in 6.6.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    scriban 6.6.0

    2 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM

    Other records, highest priority first

    • TI-2026-52558 Scriban before 6.6.0 Denial of Service via Infinite RecursionPriority HIGH 77
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-74795
  2. 2026-10-03 Alias added: GHSA-x4hp-vj3w-6w2m

References

Advisory 1

  • TI-2026-52554 Scriban before 7.0.0 MemberFilter Bypass via TemplateContext Cache CVSS 4.0CRITICAL 9.3
  • TI-2026-51270 Scriban before 7.2.2 Arbitrary Property Write via TypedObjectAccessor CVSS 4.0CRITICAL 9.3
  • TI-2026-52555 Scriban before 7.0.0 Authorization Bypass via Stale Include Cache CVSS 4.0CRITICAL 9.2
  • TI-2026-52558 Scriban before 6.6.0 Denial of Service via Infinite Recursion CVSS 4.0HIGH 8.7
  • TI-2026-52556 Scriban before 7.0.0 Stack Overflow via nested array initializers CVSS 4.0HIGH 8.7
  • TI-2026-52552 Scriban before 7.0.0 Denial of Service via string.pad_left/pad_right CVSS 4.0HIGH 8.7
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences