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Vulnerability record · CVE-2026-37535 · published 1 May 2026

CVE-2026-37535: Out-of-bounds read vulnerability

openxc/isotp-c thru commit 5a5d19245f65189202719321facd49ce6f5d46ac (2021-08-09) contains an out-of-bounds read in the ISO-TP Single Frame receive handler, where the 4-bit payload length nibble is used directly as the memcpy size without validating it against the actual CAN data length. A malicious CAN frame with an oversized length nibble can cause memory reads beyond the buffer, allowing attackers to cause a denial of service, or gain sensitive information.

7.1 CVSS 3.1 High EPSS 0.33% · top 76.3% CWE-125 · Out-of-bounds read Awaiting Analysis
7.1CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

openxc/isotp-c thru commit 5a5d19245f65189202719321facd49ce6f5d46ac (2021-08-09) contains an out-of-bounds read in the ISO-TP Single Frame receive handler, where the 4-bit payload length nibble is used directly as the memcpy size without validating it against the actual CAN data length. A malicious CAN frame with an oversized length nibble can cause memory reads beyond the buffer, allowing attackers to cause a denial of service, or gain sensitive information.

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

References

LinkTags
https://gist.github.com/sgInnora/f4ac66faeefe07a653ceeb3f58cdc381
https://github.com/openxc/isotp-c
https://github.com/openxc/isotp-c/blob/master/src/isotp/receive.c

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Source: NIST National Vulnerability Database (record CVE-2026-37535), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.