split_image_check()
Source GCVE Database
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
Thin evidence
One scorer or none| CNA (zephyr) | CVSS 3.1 | 2.9 |
|---|
- 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:LExploitation evidence
Disclosed: evidence found.
CVE published 13 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| mcu-toolsmcuboot | Affected
| Fixed in
|
GitHubmcubootpkg:github/mcubootOther threats | Affected
| Fixed in
|
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.