Out-of-Bounds Read Vulnerability in Janet Programming Language by Janet-lang
CVE-2026-2240

4.8MEDIUM

Key Information:

Vendor

Janet-lang

Status
Janet
Vendor
CVE Published:
9 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2240?

A vulnerability exists in the Janet programming language, specifically in the janetc_pop_funcdef function located in src/core/compile.c. This issue allows for out-of-bounds read operations, potentially exposing sensitive data when exploited. The attack must be executed locally. It is crucial for users of Janet versions up to 1.40.1 to apply the provided patch (commit hash 4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5) to mitigate the risk posed by this vulnerability.

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Deploy the Patch

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-2026-2240 - Proof of Concept

References

https://vuldb.com/?id.344979
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344979
signaturepermissions-required
https://vuldb.com/?submit.753155
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)
JSON
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