Is there a public exploit for CVE-2026-16662?

No public exploit for CVE-2026-16662 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-2026-16662?

CVE-2026-16662 scores CVSS 2.4 (v3.1), rated low.

What does CVE-2026-16662 affect?

CVE-2026-16662 affects mcu-tools mcuboot.

2.4 Low

bootsavebootstatus() in boot/bootutil/src/bootrecord.c reads the image's EXPECTEDHASHTLV into a stack buffer imagehash[IMAGEHASHSIZE] that…

CVE-2026-16662

bootsavebootstatus() in boot/bootutil/src/bootrecord.c reads the image's EXPECTEDHASHTLV into a stack buffer imagehash[IMAGEHASHSIZE] that is never zero-initialised. The TLV handler validates only the upper bound (len > sizeof(imagehash)) and then reads exactly len bytes, so a TLV shorter than IMAGEHASHSIZE leaves the tail of imagehash holding stale stack content. The subsequent copy into the boot record, memcpy(buf + offset, imagehash, sizeof(imagehash)), uses the fixed buffer size rather than len, so up to IMAGEHASHSIZE - 1 bytes of uninitialised bootloader stack are written into the measured-boot record. The defect is reachable only under MCUBOOTMEASUREDBOOT, and only when the image reaching bootsavebootstatus() was not hash-validated on that boot. bootutilimgvalidate() rejects a hash TLV whose length is not exactly sizeof(hash) (boot/bootutil/src/imagevalidate.c:345), and primary-slot validation is on by default (Zephyr's CONFIGBOOTVALIDATESLOT0 defaults to y), so in a default build the malformed image never reaches this code. The direct-XIP and RAM-load strategies in boot/bootutil/src/loader.c validate the selected slot unconditionally and are not affected. The short TLV…

Assessment

CVSS: 2.4 (v3.1)
Severity: Low
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:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

At the source

EUVD (ENISA)

References

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