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CVE-2026-16671VulnerabilityPublished

split_image_check()

Source GCVE Database

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Authoritative record:CVE-2026-16671· Low 2.9

Not known to be exploited · CVSS 2.9 Low : upgrade to 2.5.0 when convenient.

Data as of 13 Nov 2026, 04:30 UTC

CVSS 3.1 base score
2.9Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (zephyr)CVSS 3.12.9
Patch
Available – fixed in 2.5.0
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade mcuboot to 2.5.0.

Affected software

ProductAffectedFixed in
mcu-toolsmcubootAffected
  • >=2.0.0 <2.5.0
Fixed in
  • 2.5.0
GitHubmcubootpkg:github/mcubootOther threatsAffected
  • >=2.0.0 <2.5.0
Fixed in
  • 2.5.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

The fix involves resizing the loader_hash buffer to match IMAGE_HASH_SIZE and passing IMAGE_HASH_SIZE as the seed length to prevent overflow. Users should apply this fix if using the affected non-default configurations. In default SHA-256 builds, no overflow occurs. Monitor vendor advisories for an official patch or update.

Description

CVE-2026-16671 is a low-severity buffer overflow vulnerability in MCUboot's split_image_check() function when using non-default configurations with larger digest sizes (SHA-512 or EC384). The fixed 32-byte buffer loader_hash is overflowed by 16 or 32 bytes due to a mismatch with the configured hash size, causing stack corruption. This can lead to boot instability or failure but does not allow attacker-controlled code execution.

References

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