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No exploitation reportedAwaiting NVD analysis

CVE-2026-124437

Scriban before 7.5.3 Denial of Service via Unguarded Builtins and Recursion

No exploitation reported by the sources we read.

  • Published2026-11-08
  • WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-11-0813:15CVE publishedCNA

Versions per branch

Products declared by the CNA

As VulnCheck, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • scribanother versions: not affected
    Affected
    • < 7.5.3fixed in 7.5.3semver

    Not affected = 7.5.3

  • scribanother versions: not affected
    Affected
    • < 7.5.3fixed in 7.5.3semver

    Not affected = 7.5.3

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-08

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-124437 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-08
  • CNACVSS 4.08.72026-11-08
  • CNACVSS 3.17.52026-11-08
  • CNAweakness (CWE)CWE-4002026-11-08

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 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
Published
2026-11-08

Frequently asked questions

What is 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.

Is CVE-2026-124437 actively exploited?

Active exploitation of CVE-2026-124437 has not been confirmed.

What is the CVSS score for CVE-2026-124437?

CVE-2026-124437 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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