CVE-2026-56770 | libais through 0.15 VdmStream::AddLine uses an unchecked sen… | CVSS 7.5 HIGH

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.

Metadata

CVE ID: CVE-2026-56770
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-22 21:55 UTC
Published: 2026-06-25 18:06 UTC
Last updated: 2026-06-25 18:28 UTC
Primary CWE: CWE-129
Improper Validation of Array Index
Vendor / Product: schwehr / libais
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
schwehr	libais	—	0 ≤ 0.15

Weakness (CWE)

CWE	Source	Description
CWE-129	cna	Improper Validation of Array Index

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.7	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (2)