Public mode

No access to your tenant or devices. Every item links to its source. What this means

CVE-2026-54333

UEFI Firmware Parser: Stack out-of-bounds write in tiano decompressor MakeTable

CVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-54333

Published

UEFI Firmware Parser parses BIOS, Intel ME, and UEFI firmware structures including volumes, file systems, and files. Prior to 1.14, MakeTable() in uefi_firmware/compression/Tiano/Decompress.c does not validate that bit-length values read from a crafted Tiano or EFI compressed firmware bitstream remain within the expected range from 0 through 16. The normal CompressedSection.process() to efi_compressor.TianoDecompress() to TianoDecompress() to ReadPTLen() to MakeTable() parsing path can consequently write beyond the stack-allocated Count[17] array and related decode tables. The resulting stack corruption deterministically crashes the parsing process and may permit code execution depending on build and runtime details. This issue is fixed in version 1.14.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-54333

Published

uefi-firmware-parser

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "theopolis",
                    "product": "uefi-firmware-parser",
                    "versions": [
                        {
                            "version": "< 1.14",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON