CVE-2026-2660 FascinatedBox lily lily_symtab.c shorthash_for_name use after free
A use-after-free vulnerability in the Lily programming language allows local attackers to potentially execute arbitrary code or escalate privileges.
- 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-2026-2660?
CVE-2026-2660 is a medium-severity use after free vulnerability in FascinatedBox lily, 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 was identified in FascinatedBox lily up to 2.3. Affected by this issue is the function shorthash_for_name of the file src/lily_symtab.c. The manipulation leads to use after free. Local access is required to approach this attack. The exploit is publicly available and might 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-2026-2660?
It affects 1 product.
Products include Lily-Lang Lily.
How do I fix CVE-2026-2660?
No fix has been published for CVE-2026-2660 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-2660 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2660 exists.
Other vulnerabilities in FascinatedBox lily
- CVE-2026-3390 FascinatedBox lily Error Reporting lily_build_error.c patch_line_end out-of-bounds
- CVE-2026-3391 FascinatedBox lily lily_emitter.c clear_storages out-of-bounds
- CVE-2026-3392 FascinatedBox lily lily_emitter.c eval_tree null pointer dereference
- CVE-2026-2662 FascinatedBox lily lily_emitter.c count_transforms out-of-bounds
Sources
Also known as GHSA-cq5p-w4x6-m6h3.