CVE-2026-54333 UEFI Firmware Parser - Buffer Overflow

UEFI Firmware Parser < 1.14 contains a buffer overflow caused by lack of validation of bit-length values in MakeTable() during Tiano or EFI compressed firmware parsing, letting attackers cause stack corruption and potential code execution, exploit requires crafted firmware bitstream.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.80% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to version 1.14 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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