Is there a public exploit for CVE-2026-127915?

No public exploit for CVE-2026-127915 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-2026-127915?

CVE-2026-127915 scores CVSS 2 (v3.1), rated low.

What does CVE-2026-127915 affect?

CVE-2026-127915 affects mcu-tools mcuboot.

2.0 Low

The MCUboot TLV iterator bootutiltlviternext() in boot/bootutil/src/tlv.c walks image trailer TLVs with a single loop guard (it->tlvoff…

CVE-2026-127915

The MCUboot TLV iterator bootutiltlviternext() in boot/bootutil/src/tlv.c walks image trailer TLVs with a single loop guard (it->tlvoff tlvend) and advances by sizeof(struct imagetlv) + tlv.itlen using the attacker-controlled itlen field, without validating that the entry's header or payload stays within it->tlvend. As a result the 4-byte header read can extend up to 3 bytes past the declared TLV area, and the returned (off, len) can describe a payload that runs past it. The path is pre-authentication: TLVs are parsed during bootutilimgvalidate() before the signature is verified, and a crafted image can be presented through DFU / serial-recovery / OTA. However the impact is contained by surrounding guards: bootutilimgvalidate() first rejects a TLV area larger than bootutilmaximagesize(), the default LOADIMAGEDATA sink is flasharearead() which bounds-checks against the flash partition and fails an out-of-partition read, and every payload consumer (EXPECTEDHASHTLV, EXPECTEDKEYTLV, EXPECTEDSIGTLV, IMAGETLVSECCNT) clamps len against a fixed buffer before copying. The residual effect in a default flash build is therefore an out-of-region read confined to the attacker's own slot…

Assessment

CVSS: 2 (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:H/PR:N/UI:N/S:U/C:N/I:N/A:L

At the source

EUVD (ENISA)

References

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