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CVE-2026-74795· NVD / CVE Program· CNA VulnCheck

Scriban before 6.6.0 Denial of Service via Uncontrolled Recursion

Scriban before 6.6.0 contains an uncontrolled recursion vulnerability in its recursive-descent parser. The parser does not enforce a default expression depth limit (the ExpressionDepthLimit property in ParserOptions defaults to null/disabled), so an attacker who controls template input can supply a deeply nested template (e.g., thousands of nested parentheses or blocks) that exhausts thread stack space and raises a StackOverflowException. Because a StackOverflowException cannot be caught in .NET, this causes immediate, unrecoverable termination of the hosting process, resulting in a denial of service. Applications that process untrusted or user-supplied templates can be exploited remotely without authentication.

HighCVSS 8.7 · v4.0—No exploit Fix available

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Published
Aug 16, 2026
Updated
Aug 31, 2026
EPSS
0.6% · 45th percentile
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Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
8.7
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • scriban scriban

    • 6.6.0not affected
    • before 6.6.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
NuGetscribanbefore 6.6.06.6.0
NuGetScriban.Signedbefore 6.6.06.6.0

Same product

scriban: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74790Scriban before 7.0.0 MemberFilter Bypass via TemplateContext Cache
    37Monitor
  • CVE-2026-73061Scriban before 7.2.2 Arbitrary Property Write via TypedObjectAccessor
    37Monitor
  • CVE-2026-74791Scriban before 7.0.0 Authorization Bypass via Stale Include Cache
    36Monitor
  • CVE-2026-74783Scriban 6.6.0 through 7.2.0 Parser Recursion Denial of Service
    34Monitor
  • CVE-2026-73062Scriban 3.0.0 through 7.2.0 Denial of Service via Array Multiplication
    34Monitor
  • CVE-2026-73060Scriban 3.0.0 through 7.2.5 Denial of Service via ScriptRange.Multiply
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
scriban scriban6.6.0Vendor (CNA)
NuGet:scriban6.6.0Package registry (OSV)
NuGet:Scriban.Signed6.6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-747830 days apartScriban 6.6.0 through 7.2.0 Parser Recursion Denial of Service
    34Monitor
  • CVE-2026-747870 days apartScriban before 7.0.0 Uncontrolled Recursion via object.to_json
    34Monitor
  • CVE-2026-747920 days apartScriban before 7.0.0 Stack Overflow via nested array initializers
    34Monitor
  • CVE-2026-747940 days apartScriban before 6.6.0 Denial of Service via Infinite Recursion
    34Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-674 · Uncontrolled Recursion

CVSS vector

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-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records