Integer Overflow Vulnerability in Janet Programming Language by Janet-lang
CVE-2026-10268

4.8MEDIUM

Key Information:

Vendor

Janet-lang

Status
Janet
Vendor
CVE Published:
1 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-10268?

A vulnerability has been discovered in the Janet programming language, affecting versions up to 1.41.0. The issue resides in the unmarshal_one_fiber function within the src/core/marsh.c file, where an integer overflow may occur due to inadequate input validation. An attacker can exploit this weakness locally, potentially leading to arbitrary code execution. The development team has released a patch, identified by commit d9b1d711ea1fde52ac73a82088b512a3e17bad0d, to address this critical flaw, and users are strongly advised to apply the update to ensure their systems remain secure.

Affected Version(s)

janet 1.0

janet 1.1

janet 1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-10268 - Proof of Concept

References

https://vuldb.com/vuln/367547
vdb-entrytechnical-description
https://vuldb.com/vuln/367547/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-10268
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

biniam (VulDB User)
.