Out-of-Bounds Read Vulnerability in Janet by Janet-lang
CVE-2026-2242

4.8MEDIUM

Key Information:

Vendor

Janet-lang

Status
Janet
Vendor
CVE Published:
9 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2242?

A vulnerability has been identified in Janet, the programming language developed by Janet-lang, where a flaw in the 'janetc_if' function within 'src/core/specials.c' could allow for an out-of-bounds read. This security issue requires local execution for exploitation and has been publicly disclosed, posing a risk to users. It is crucial to apply the patch identified as c43e06672cd9dacf2122c99f362120a17c34b391 to mitigate this vulnerability.

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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-2026-2242 - Proof of Concept

References

https://vuldb.com/?id.344981
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344981
signaturepermissions-required
https://vuldb.com/?submit.754495
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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