CVE-2026-2259 aardappel lobster Parsing parser.h ParseStatements memory corruption

Medium 4.8 Published 10 Feb 2026 Updated 23 Feb 2026

Local attackers can exploit memory corruption in the Lobster parser to potentially 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-2026-2259?

CVE-2026-2259 is a medium-severity memory corruption vulnerability in aardappel lobster, published on 10 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 aardappel lobster up to 2025.4. Affected by this issue is the function lobster::Parser::ParseStatements in the library dev/src/lobster/parser.h of the component Parsing. The manipulation leads to memory corruption. The attack can only be performed from a local environment. The exploit has been disclosed to the public and may be used. The identifier of the patch is 2f45fe860d00990e79e13250251c1dde633f1f89. Applying a patch is the recommended action to fix this issue.

Weakness: CWE-787, CWE-119

Which versions are affected by CVE-2026-2259?

It affects 1 product.

Products include Strlen Lobster.

How do I fix CVE-2026-2259?

No fix has been published for CVE-2026-2259 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-2026-2259 being exploited?

There is no known exploitation of CVE-2026-2259 in the wild and no public exploit code.

Sources

Also known as GHSA-xfpq-772f-h5qw.