CVE-2026-56770Public exploitNetwork attack vector

Service crash via unchecked AIS sequence index

Published Jun 25, 2026 · Updated Jun 25, 2026

Out-of-bounds vector access in libais 0.15 and earlier allows remote attackers to crash services via crafted AIVDM sentences. VdmStream::AddLine accepts the 999999 no-sequence sentinel for a fragmented message and uses it to index the ten-element incoming_sentences_ vector. One unauthenticated AIS sentence received over VHF radio or an IP feed reaches the flaw; debug builds abort, while the demonstrated release build crashes on an invalid read and broader memory corruption remains unproven.

CVSS severity8.7
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds vector access in libais 0.15 and earlier allows remote attackers to crash services via crafted AIVDM sentences. VdmStream::AddLine accepts the 999999 no-sequence sentinel for a fragmented message and uses it to index the ten-element incoming_sentences_ vector. One unauthenticated AIS sentence received over VHF radio or an IP feed reaches the flaw; debug builds abort, while the demonstrated release build crashes on an invalid read and broader memory corruption remains unproven.

The record

CVE
CVE-2026-56770
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Kurt Schwehr
Product
libais
Classifications
CWE-129, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kurt Schwehr · libaisversion=0 <=0.15

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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