CVE-2026-78161 warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_cbor out-of-bounds write
Remote attackers can trigger an out-of-bounds write in libwebsockets LECP CBOR recording, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-78161?
CVE-2026-78161 is a medium-severity memory corruption vulnerability in warmcat libwebsockets, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in warmcat libwebsockets 4.5.0. Impacted is the function report_raw_cbor of the file lib/misc/lecp.c of the component LECP CBOR Recording. The manipulation results in out-of-bounds write. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as 1d44554a1bb262db63ff4e240152a9deecd99054. It is best practice to apply a patch to resolve this issue.
Which versions are affected by CVE-2026-78161?
How do I fix CVE-2026-78161?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-78161 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78161 exists.
Sources
Also known as BELL-CVE-2026-78161, DEBIAN-CVE-2026-78161, GHSA-83xp-6qr9-g946, UBUNTU-CVE-2026-78161.