CVE-2026-0849: zephyrproject-rtos zephyr Classic Buffer Overflow

Vulnerability summary

CVE-2026-0849 is a medium (CVSS 6.8) Classic Buffer Overflow vulnerability in zephyrproject-rtos zephyr. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.7% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 14-03-2026
   PublishedVulnerability first disclosed.
2. 15-10-2026
   Last modifiedVulnerability information updated.

Description

Malformed ATAES132A responses with an oversized length field overflow a 52-byte stack buffer in the Zephyr crypto driver, allowing a compromised device or bus attacker to corrupt kernel memory and potentially hijack execution.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.