Out-of-Bounds Read Vulnerability in Janet-lang Janet by Janet-lang
CVE-2026-2869

4.8MEDIUM

Key Information:

Vendor

Janet-lang

Status
Janet
Vendor
CVE Published:
21 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2869?

A vulnerability exists in the Janet programming language in the function janetc_varset located in src/core/specials.c, which can lead to an out-of-bounds read. This flaw can only be exploited from a local environment. Public exploits are available, emphasizing the urgency of updating to version 1.41.0, which addresses this issue with a patch identified as 2fabc80151a2b8834ee59cda8a70453f848b40e5. Users are strongly advised to upgrade to safeguard against potential exploitation.

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Deploy the Patch

Affected Version(s)

janet 1.40.0

janet 1.40.1

janet 1.41.0

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-2026-2869 - Proof of Concept

References

https://vuldb.com/?id.347106
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347106
signaturepermissions-required
https://vuldb.com/?submit.754589
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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