Out-of-Bounds Read Vulnerability in Janet Language by Janet-lang
CVE-2026-2241

4.8MEDIUM

Key Information:

Vendor

Janet-lang

Status
Janet
Vendor
CVE Published:
9 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2241?

A vulnerability has been identified in Janet Language versions prior to 1.40.1, specifically within the os_strftime function of the src/core/os.c file. This flaw allows local attackers to perform manipulations that could result in out-of-bounds reads. Such vulnerabilities can lead to unauthorized data exposure or program crashes. It’s crucial for users to apply the available patch, identified as 0f285855f0e34f9183956be5f16e045f54626bff, to mitigate potential exploitation, as this issue has already been made public.

Affected Version(s)

janet 1.40.0

janet 1.40.1

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-2026-2241 - Proof of Concept

References

https://vuldb.com/?id.344980
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344980
signaturepermissions-required
https://vuldb.com/?submit.753156
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

Oneafter (VulDB User)
.