PatchTheCVECVE-2026-13479: The LoRaWAN application-layer clock-synchronization service parses downlinks in clock_sync_package_callback()
CVE-2026-13479 is a low-severity flaw (CVSS 3.1) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The LoRaWAN application-layer clock-synchronization service parses downlinks in clock_sync_package_callback() (subsys/lorawan/services/clock_sync.c). Its command loop only guarantees that the one-byte command id is in bounds; for the CLOCK_SYNC_CMD_APP_TIME (AppTimeAns) command the handler then reads a 4-byte time correction via sys_get_le32() plus a 1-byte token without checking that 5 bytes remain in the receive buffer (len - rx_pos). A short o
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 3.1 (Low) |
| Attack vector | Adjacent network |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 87%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-08-26 |
| Last modified | 2026-08-31 |
Last updated 2026-08-31 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-13479?
zephyr: upgrade to 4.4.2. Exact commands for each OS are on this page.
Is CVE-2026-13479 being exploited?
CVE-2026-13479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-13479 affect?
CVE-2026-13479 affects zephyr. Severity is low (CVSS 3.1). The LoRaWAN application-layer clock-synchronization service parses downlinks in clock_sync_package_callback() (subsys/lorawan/services/clock_sync.c). Its command loop only guarantees that the one-byte command id is in bounds; for the CLOCK_
How urgent is CVE-2026-13479?
Priority 19/100. Public exploit reference
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