Is there a public exploit for CVE-2026-16664?

No public exploit for CVE-2026-16664 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-16664?

CVE-2026-16664 scores CVSS 5.1 (v3.1), rated medium.

What does CVE-2026-16664 affect?

CVE-2026-16664 affects mcu-tools mcuboot.

5.1 Medium

MCUboot's Zephyr serial-recovery upload handler bsupload() in boot/bootserial/src/bootserial.c decodes the host-supplied image field of an…

CVE-2026-16664

MCUboot's Zephyr serial-recovery upload handler bsupload() in boot/bootserial/src/bootserial.c decodes the host-supplied image field of an MCUmgr image-upload request into imgnum (a full 32-bit value) and latches it on the off == 0 packet without any range check. It then passes imgnum straight to flashareaidfrommultiimageslot(imgnum, 0), which on the Zephyr port resolves to flashareaidsforslot() in boot/zephyr/include/sysflash/sysflash.h and indexes the static const int allslots[] table as allslots[imgnum 2]. That table holds only MCUBOOTIMAGENUMBER 2 entries, so any imgnum >= MCUBOOTIMAGENUMBER is an out-of-bounds read. The path is reachable by anyone with access to the serial / SMP recovery console, which is unauthenticated by design, and the bad value is supplied before any image signature is verified. The defect is specific to the default non-direct upload path (MCUBOOTSERIALDIRECTIMAGEUPLOAD disabled) on the Zephyr port with the array-backed slot layout (not CONFIGSINGLEAPPLICATIONSLOT). It is not gated on a multi-image configuration: MCUBOOTIMAGENUMBER defaults to 1, so even a default single-image build is affected for any image >= 1. The MCUBOOTSERIALDIRECTIMAGEUPLOAD path…

Assessment

CVSS: 5.1 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 November 2026
Last updated: 13 November 2026
Affected: mcu-tools · mcuboot
Assigner: zephyr

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

At the source

EUVD (ENISA)

References

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