How severe is CVE-2026-56790?

CVE-2026-56790 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2026-56790 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-56790?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-56790 have an EU (EUVD) identifier?

Yes. CVE-2026-56790 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39532.

When was CVE-2026-56790 published?

CVE-2026-56790 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-56790

CVE-2026-56790 is a high-severity vulnerability with a CVSS 3.x base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-193.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v4: 7.0
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39532
Weakness: CWE-193
Published: 2026-06-25
Last modified: 2026-06-26

Description

CANBoat through 6.22, fixed in commit a5a22b7, contains an off-by-one global buffer overflow in the searchForPgn() function in analyzer/pgn.c that allows remote attackers to crash the application. Attackers can deliver a crafted NMEA-2000 message with an out-of-range PGN value over CAN bus or N2K-over-IP to trigger an out-of-bounds array access and denial of service.

Frequently asked questions

What is CVE-2026-56790?: CANBoat through 6.22, fixed in commit a5a22b7, contains an off-by-one global buffer overflow in the searchForPgn() function in analyzer/pgn.c that allows remote attackers to crash the application. Attackers can deliver a crafted NMEA-2000 message with an out-of-range PGN value over CAN bus or N2K-over-IP to trigger an out-of-bounds array access and denial of service.
How severe is CVE-2026-56790?: CVE-2026-56790 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2026-56790 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-56790?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-56790 have an EU (EUVD) identifier?: Yes. CVE-2026-56790 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39532.
When was CVE-2026-56790 published?: CVE-2026-56790 was published on 2026-06-25 and last updated on 2026-06-26.

References

Other CWE-193 (Off-by-one Error) vulnerabilities

CVE-2024-10442 — Critical (CVSS 10.0): Off-by-one error vulnerability in the transmission component in Synology Replication Service before 1.0.12-0066,…
CVE-2026-53309 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: fix off-by-one in dlm_match_regions()…
CVE-2024-38441 — Critical (CVSS 9.8): Netatalk before 3.2.1 has an off-by-one error and resultant heap-based buffer overflow because of setting ibuf[len] to…
CVE-2023-46853 — Critical (CVSS 9.8): In Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is used…
CVE-2023-38429 — Critical (CVSS 9.8): An issue was discovered in the Linux kernel before 6.3.4. fs/ksmbd/connection.c in ksmbd has an off-by-one error in…
CVE-2022-34970 — Critical (CVSS 9.8): Crow before 1.0+4 has a heap-based buffer overflow via the function qs_parse in query_string.h. On successful…

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