Buffer overflow in Janet-Lang Janet
CVE-2026-2869
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (11.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Janet-Lang Janet — versions 1.40.0, 1.40.1, 1.41.0
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/janet-lang/janet/issues/1699 (issue-tracking, Exploit, Issue Tracking)
- github.com/oneafter/0123/blob/main/ja1/repro (Exploit, exploit)
- github.com/janet-lang/janet/commit/2fabc80151a2b8834ee59cda8a70453f848b40e5 (Patch, patch)
- github.com/janet-lang/janet/releases/tag/v1.41.0 (Release Notes, patch)
- github.com/janet-lang/janet/ (Product, product)
Frequently asked questions
- What is CVE-2026-2869?
- CVE-2026-2869 is a low-severity vulnerability in Janet-Lang Janet, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 3.3/10. Published 2026-02-21.
- How severe is CVE-2026-2869?
- Low severity. CVSS v3 base score is 3.3 out of 10.