CVE-2026-56770 libais 0.15 - Out-of-bounds Vector Access in VdmStream::AddLine via Invalid Sequential Message ID
Remote attackers can crash AIS services or potentially execute code by sending crafted AIVDM sentences with invalid sequential message IDs to libais.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56770?
CVE-2026-56770 is a high-severity memory corruption vulnerability in schwehr libais, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
libais through 0.15 VdmStream::AddLine uses an unchecked sentinel value as a vector index when processing AIS sentences with empty or out-of-range sequential message IDs. Remote attackers can crash services or vessel systems by sending crafted AIVDM sentences over VHF marine radio or IP feeds, causing out-of-bounds memory access and potential corruption.
Weakness: CWE-129
Which versions are affected by CVE-2026-56770?
How do I fix CVE-2026-56770?
No fix has been published for CVE-2026-56770 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-2026-56770 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56770 exists.
Sources
Also known as DEBIAN-CVE-2026-56770, GHSA-2f4m-q55c-v3xr, UBUNTU-CVE-2026-56770.