Is there a public exploit for CVE-2026-16671?

No public exploit for CVE-2026-16671 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-2026-16671?

CVE-2026-16671 scores CVSS 2.9 (v3.1), rated low.

What does CVE-2026-16671 affect?

CVE-2026-16671 affects mcu-tools mcuboot.

2.9 Low

splitimagecheck() in boot/bootutil/src/loader.c declares a fixed uint8t loaderhash[32] buffer and passes it as the outhash out-parameter to…

CVE-2026-16671

splitimagecheck() in boot/bootutil/src/loader.c declares a fixed uint8t loaderhash[32] buffer and passes it as the outhash out-parameter to bootutilimgvalidate(). That routine copies IMAGEHASHSIZE bytes into outhash (memcpy(outhash, hash, IMAGEHASHSIZE) in boot/bootutil/src/imagevalidate.c), where IMAGEHASHSIZE is a compile-time constant of 64 for MCUBOOTSHA512 or 48 for MCUBOOTSIGNEC384/SHA-384 (boot/bootutil/include/bootutil/crypto/sha.h). The buffer tracks SHA-256 (32 bytes) while the copy length tracks the configured algorithm, so the write overruns the buffer by 16 or 32 bytes. The overflow is only present in a non-default configuration: the legacy Mynewt split-image feature must be compiled (splitgo()/splitimagecheck(), i.e. neither MCUBOOTDIRECTXIP nor MCUBOOTRAMLOAD), the digest must be larger than 32 bytes (MCUBOOTSHA512 or MCUBOOTSIGNEC384), and MCUBOOTSIGNPURE must be off. splitgo() is a public API with no caller inside MCUboot; it is invoked from a Mynewt application. In the default SHA-256 build there is no overflow. The over-written bytes are the one-way digest of the loader image and the overflow length is fixed at build time, so the contents are not meaningfully…

Assessment

CVSS: 2.9 (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:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

At the source

EUVD (ENISA)

References

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