CVE-2026-124437
Scriban before 7.5.3 Denial of Service via Unguarded Builtins and Recursion
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| scriban scriban Scriban
nuget |
≥ 0; < 7.5.3 (affected, semver) 7.5.3 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| scriban scriban Scriban.Signed
nuget |
≥ 0; < 7.5.3 (affected, semver) 7.5.3 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.7 high |
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 | CNA: VulnCheck |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: VulnCheck |
| 4.0 / 8.7 high |
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD: [email protected] |
Exploit evidence
- https://github.com/scriban/scriban/security/advisories/GHSA-95w2-9mjq-6c74
exploit · ADP: CISA-ADP
References
- https://github.com/scriban/scriban/security/advisories/GHSA-95w2-9mjq-6c74CNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/scriban-before-7.5.3-denial-of-service-via-unguarded-builtins-and-recursionCNA: VulnCheck · third-party-advisory
- https://github.com/scriban/scriban/security/advisories/GHSA-95w2-9mjq-6c74ADP: CISA-ADP · exploit
- https://github.com/scriban/scriban/security/advisories/GHSA-95w2-9mjq-6c74[email protected]
- https://www.vulncheck.com/advisories/scriban-before-7.5.3-denial-of-service-via-unguarded-builtins-and-recursion[email protected]
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