How severe is CVE-2026-37534?

CVE-2026-37534 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-37534 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-37534?

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

Does CVE-2026-37534 have an EU (EUVD) identifier?

Yes. CVE-2026-37534 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26687.

When was CVE-2026-37534 published?

CVE-2026-37534 was published on 2026-05-01 and last updated on 2026-06-17.

CVE-2026-37534

CVE-2026-37534 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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-191.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26687
Weakness: CWE-191
Published: 2026-05-01
Last modified: 2026-06-17

Description

Integer underflow vulnerability in Open-SAE-J1939 thru commit b6caf884df46435e539b1ecbf92b6c29b345bdfe (2025-11-30) in SAE_J1939_Read_Transport_Protocol_Data_Transfer,allows attackers to write to arbitrary memory via crafted sequence number from the CAN frame.

Frequently asked questions

What is CVE-2026-37534?: Integer underflow vulnerability in Open-SAE-J1939 thru commit b6caf884df46435e539b1ecbf92b6c29b345bdfe (2025-11-30) in SAE_J1939_Read_Transport_Protocol_Data_Transfer,allows attackers to write to arbitrary memory via crafted sequence number from the CAN frame.
How severe is CVE-2026-37534?: CVE-2026-37534 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-37534 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-37534?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-37534 have an EU (EUVD) identifier?: Yes. CVE-2026-37534 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26687.
When was CVE-2026-37534 published?: CVE-2026-37534 was published on 2026-05-01 and last updated on 2026-06-17.

References

Other CWE-191 (Integer Underflow) vulnerabilities

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