CVE-2026-2869 janet-lang janet handleattr specials.c janetc_varset out-of-bounds

Medium 4.8 Published 21 Feb 2026 Updated 23 Feb 2026

A local attacker can trigger an out-of-bounds read in the Janet language interpreter, potentially causing crashes or leaking memory.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-2869?

CVE-2026-2869 is a medium-severity memory corruption vulnerability in janet-lang janet, published on 21 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-125, CWE-119

Which versions are affected by CVE-2026-2869?

It affects 1 product.

Products include Janet-Lang Janet.

How do I fix CVE-2026-2869?

No fix has been published for CVE-2026-2869 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-2869 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2869 exists.

Sources

Also known as GHSA-925f-q35m-63gx.