Scriban before 7.0.0 Denial of Service via Unbounded Template Output (CVE-2026-74786) | HOL Guard CVE

Medium · CVSS 6.5CVE-2026-74786

Scriban before 7.0.0 Denial of Service via Unbounded Template Output

Answer in brief

CVE-2026-74786 records a Medium severity (CVSS 6.5) vulnerability in Scriban before 7.0.0 Denial of Service via Unbounded Template Output. The current sources do not mark it as known exploited. The current feed maps scriban/scriban (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 16, 2026Updated Aug 31, 2026Source checked Sep 30, 2026First seen by HOL Aug 16, 2026Material review Aug 31, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps scriban/scriban (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
scriban/scribangeneric	>=0 <7.0.0	7.0.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for scriban/scriban.
Review the reported fix. Update scriban/scriban to 7.0.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 16, 2026

Sources and claim methodology

Upstream source description

Scriban before 7.0.0 (affected versions <= 6.6.0) contains a denial-of-service vulnerability in which the LimitToString safety limit (default 1MB) can be bypassed because ObjectToString resets the per-call length counter (_currentToStringLength) on every top-level call and StringBuilderOutput enforces no cumulative output-size limit. An attacker who can supply a template can render a near-limit string repeatedly in a loop, allocating approximately 1GB of memory and causing an out-of-memory condition that crashes the host application.

Quoted source text, attributed separately from HOL analysis.