Is there a public exploit for CVE-2026-127916?

No public exploit for CVE-2026-127916 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-2026-127916?

CVE-2026-127916 scores CVSS 2.9 (v3.1), rated low.

What does CVE-2026-127916 affect?

CVE-2026-127916 affects mcu-tools mcuboot.

2.9 Low

bootutilimghash() computes the image digest over ihhdrsize + ihimgsize + ihprotecttlvsize bytes, all three taken from the candidate image's…

CVE-2026-127916

bootutilimghash() computes the image digest over ihhdrsize + ihimgsize + ihprotecttlvsize bytes, all three taken from the candidate image's header, and reads that span out of the slot without checking that it fits in the flash area. The three sizes are also summed without an overflow check. Nothing earlier on the validation path bounds the whole span either: bootutilimgvalidate() compares the image size against bootutilmaximagesize() only after the hash has been computed. The callers bound part of the span, or none of it: On the swap and overwrite upgrade path, bootvalidateslot() first runs the image header check (bootisheadervalid(), later bootcheckheadervalid()). Before MCUboot 2.2.0 that check covered only ihhdrsize + ihimgsize, so for every image the protected-TLV area (ihprotecttlvsize, a uint16t, up to 65535 bytes) was hashed without being bounded. From 2.2.0 the check includes ihprotecttlvsize, except for a compressed image in the secondary slot when MCUBOOTDECOMPRESSIMAGES (CONFIGBOOTDECOMPRESSION) is enabled, which leaves the same gap of up to 64 KB. The serial recovery image-list and image-state handlers (bslist() and bsset() in boot/bootserial/src/bootserial.c) and…

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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