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CVE-2026-54333

CVE-2026-54333 · UEFI Firmware Parser: Stack out-of-bounds write in tiano decompressor MakeTable

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 9.8 · Critical · EPSS 0.8%

Published
Updated

Stack: python

Affected products and versions

  • uefi-firmware-parser

    Versions
    • < 1.14: Affected

    No fix published

  • uefi-firmware PyPI

    Versions
    • 1.1
    • 1.10
    • 1.11
    • 1.2
    • 1.3
    • 1.4
    • 1.6
    • 1.7
    • 1.8
    • 1.9
    Affected ranges
    • ECOSYSTEM: ≤ 1.12

    No fix published

Original sources

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