CVE-2026-2657 wren-lang wren Error Message wren_compiler.c printError stack-based overflow
A stack-based buffer overflow in the Wren language compiler allows local attackers to execute arbitrary code or cause denial of service.
- 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-2026-2657?
CVE-2026-2657 is a medium-severity memory corruption vulnerability in wren-lang wren, published on 18 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been found in wren-lang wren up to 0.4.0. This impacts the function printError of the file src/vm/wren_compiler.c of the component Error Message Handler. Such manipulation leads to stack-based buffer overflow. An attack has to be approached locally. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-2657?
It affects 1 product.
Products include Wren Wren.
How do I fix CVE-2026-2657?
No fix has been published for CVE-2026-2657 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-2026-2657 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2657 exists.
Other vulnerabilities in wren-lang wren
- CVE-2026-3385 wren-lang wren wren_compiler.c resolveLocal recursion
- CVE-2026-3386 wren-lang wren wren_compiler.c emitOp out-of-bounds
- CVE-2026-3387 wren-lang wren wren_compiler.c getByteCountForArguments null pointer dereference
- CVE-2026-2858 wren-lang wren Source File wren_compiler.c peekChar out-of-bounds
Sources
Also known as GHSA-6rjp-j8mc-4f57.