# CVE-2026-74783 — scriban

> As of 2026-08-17, CVE-2026-74783 is a HIGH-severity vulnerability in scriban, CVSS v3.1 7.5, EPSS 0.2% (20.3th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-74783 as of 2026-08-17; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-17

## What is CVE-2026-74783?

Scriban versions 6.6.0 through 7.2.0 contain a non-enforcing ExpressionDepthLimit guard that fails to stop recursive descent parsing of deeply nested expressions. Attackers can supply templates with deeply nested parentheses, array initializers, object initializers, or unary operators to trigger an uncatchable StackOverflowException that immediately terminates the host process.

The record classifies CVE-2026-74783 under weakness class [CWE-674](https://intel.threadlinqs.com/cwe/CWE-674). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 50 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **CVSS v4.0 base score:** 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 20.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-16, last modified 2026-08-17

## Is CVE-2026-74783 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [scriban](https://intel.threadlinqs.com/vendors/scriban): scriban

## How to fix CVE-2026-74783

No vendor patch reference has been recorded for CVE-2026-74783 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-74783

No threat campaign in the Threadlinqs corpus currently references CVE-2026-74783, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-17. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/scriban/scriban/security/advisories/GHSA-6q7j-xr26-3h2c)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/scriban-through-parser-recursion-denial-of-service)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-74783
Full detection coverage and IOCs for threats exploiting CVE-2026-74783 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp