High severity7.5NVD Advisory· Published Jun 25, 2026· Updated Jun 25, 2026

CVE-2026-56770

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.

Affected products

Libais/libaisllm-create
Range: <=0.15

Patches

Vulnerability mechanics

References

github.com/schwehr/libais/issues/263nvd
www.vulncheck.com/advisories/libais-out-of-bounds-vector-access-in-vdmstream-addline-via-invalid-sequential-message-idnvd

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cvss	0.488
epss	0.000
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patch	-0.070
ransomware	0.000