CVE-2026-2869

janet-lang janet handleattr specials.c janetc_varset out-of-bounds

State: Published
Severity: 4.8 Medium
Published: Feb 21, 2026
Updated: Feb 23, 2026
Reserved: Feb 20, 2026

Description

A vulnerability was identified in janet-lang janet up to 1.40.1. Affected by this vulnerability is the function janetc_varset of the file src/core/specials.c of the component handleattr Handler. The manipulation leads to out-of-bounds read. The attack can only be performed from a local environment. The exploit is publicly available and might be used. Upgrading to version 1.41.0 addresses this issue. The identifier of the patch is 2fabc80151a2b8834ee59cda8a70453f848b40e5. The affected component should be upgraded.

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	3.3 Low	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
3.0	3.3 Low	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
2.0	1.7 Low	AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-125 Out-of-Bounds Read
CWE-119 Memory Corruption

Affected Products

Product	Versions
janetjanet-lang	1.40.0Affected 1.40.1Affected 1.41.0Not affected

References

VDB-347106 | janet-lang janet handleattr specials.c janetc_varset out-of-boundsvdb-entrytechnical-description
VDB-347106 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
Submit #754589 | janet-lang janet 4dd08a4 Heap-based Buffer Overflowthird-party-advisory
https://github.com/janet-lang/janet/issues/1699issue-tracking
https://github.com/oneafter/0123/blob/main/ja1/reproexploit
https://github.com/janet-lang/janet/commit/2fabc80151a2b8834ee59cda8a70453f848b40e5patch
https://github.com/janet-lang/janet/releases/tag/v1.41.0patch
https://github.com/janet-lang/janet/product

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