CVE-2026-2016 happyfish100 libfastcommon base64.c base64_decode stack-based overflow
A stack-based buffer overflow in libfastcommon's base64 decoder 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-2026-2016?
CVE-2026-2016 is a medium-severity memory corruption vulnerability in happyfish100 libfastcommon, published on 6 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A security vulnerability has been detected in happyfish100 libfastcommon up to 1.0.84. Affected by this vulnerability is the function base64_decode of the file src/base64.c. The manipulation leads to stack-based buffer overflow. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. The identifier of the patch is 82f66af3e252e3e137dba0c3891570f085e79adf. Applying a patch is the recommended action to fix this issue.
Which versions are affected by CVE-2026-2016?
It affects 1 product.
Products include Happyfish100 Libfastcommon.
How do I fix CVE-2026-2016?
No fix has been published for CVE-2026-2016 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-2026-2016 being exploited?
There is no known exploitation of CVE-2026-2016 in the wild and no public exploit code.
Sources
Also known as GHSA-v5g8-2q7f-c524.