Resource exhaustion in Scriban
CVE-2026-124437
Scriban before 7.5.3 contains a resource exhaustion vulnerability that allows untrusted template authors to exhaust memory and CPU because builtins like math.format, regex.replace and string.escape skip the LimitToString allocation guard. Attackers can submit small templates using huge format precision specifiers, shared-structure array comparison, BigInteger multiplication or exponential function recursion that ignore LoopLimit and CancellationToken, crashing or stalling multi-tenant hosts.
Vulnerability class: DoS (Denial of Service)
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-95w2-9mjq-6c74) (vendor-advisory)
- VulnCheck Advisory: Scriban before 7.5.3 Denial of Service via Unguarded Builtins and Recursion (third-party-advisory)
Frequently asked questions
- What is CVE-2026-124437?
- CVE-2026-124437 is a high-severity vulnerability in Scriban, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-11-08.
- How severe is CVE-2026-124437?
- High severity. CVSS v3 base score is 7.5 out of 10.