Out-of-Bounds Memory Access in libais Affects Marine Communication Systems
CVE-2026-56770

8.7HIGH

Key Information:

Vendor

Schwehr

Status
Libais
Vendor
CVE Published:
25 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-56770?

The vulnerability in libais arises from VdmStream::AddLine utilizing an unchecked sentinel value as a vector index. This flaw occurs when processing AIS sentences that contain empty or out-of-range sequential message IDs. Malicious actors can exploit this by sending specially crafted AIVDM sentences over VHF marine radio or IP feeds, leading to out-of-bounds memory access issues. Such exploitation can result in service crashes or instability in vessel systems, posing significant risks to marine operations.

Affected Version(s)

libais 0 <= 0.15

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-56770 - Proof of Concept

References

https://github.com/schwehr/libais/issues/263
technical-descriptionexploit
https://www.vulncheck.com/advisories/libais-out-of-bounds...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

FuzzingLabs
.