Scriban versions from 3.0.0 through 7.2.5 contain a denial of service vulnerability in the ScriptRange.Multiply operator that bypasses LoopLimit when the left operand is a lazy sequence. Attackers can supply templates with array multiplication on lazy sequences to execute billions of uncharged iterations, pinning CPU cores and exhausting garbage collection resources even when LoopLimit is set to 1.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/scriban/scriban/commit/205ca6a7c2349d3d388bd5f1f7729ee198c0d…
disclosure@vulncheck.com
https://github.com/scriban/scriban/commit/c3f03bfc912e14b306a01a03e611f606b05f9…
disclosure@vulncheck.com
https://github.com/scriban/scriban/security/advisories/GHSA-89cf-6hmv-8rxm
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/scriban-through-denial-of-service-via-scri…
disclosure@vulncheck.com