CRITICAL

CVE-2026-54333

2026-09-14 CVSS v3.1

CVSS

9.8

Description

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.

Weakness (CWE)

CWE-787 Out-of-bounds Write

EPSS Score

0.43%

Probability of exploitation in next 30 days

37.2th percentile

References

https://github.com/theopolis/uefi-firmware-parser/commit/bf3dfaa8a05675bae6ea0cbfa082ddcebfcde23e https://github.com/theopolis/uefi-firmware-parser/pull/145 https://github.com/theopolis/uefi-firmware-parser/releases/tag/v1.14 https://github.com/theopolis/uefi-firmware-parser/security/advisories/GHSA-2689-5p89-6j3j

View on dbcve.org

Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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