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Critical · 9.8 CVE-2026-54334 EUVD-2026-78065GHSA-hm2w-vr2p-hq7wPYSEC-2026-3394

UEFI Firmware Parser: Heap out-of-bounds write in tiano decompressor `ReadCLen`

Published Sep 14, 2026 · Updated Sep 16, 2026 · Assigned by GitHub_M

Description

UEFI Firmware Parser parses BIOS, Intel ME, and UEFI firmware structures including volumes, file systems, and files. Prior to 1.14, ReadCLen() in uefi_firmware/compression/Tiano/Decompress.c reads Number from GetBits(Sd, CBIT) with CBIT = 9 and can obtain 511 entries for the 510-element Sd->mCLen heap array because its loop does not enforce Index < NC. The CharC == 2 run-length path can additionally request up to 531 zero writes through Sd->mCLen[Index++] = 0. The normal CompressedSection.process() to efi_compressor.TianoDecompress() to TianoDecompress() to DecodeC() to ReadCLen() parsing path therefore permits crafted Tiano or EFI compressed firmware to corrupt heap memory, deterministically crash the parsing process, and potentially execute code depending on build and runtime details. This issue is fixed in version 1.14.

Affected products

VendorProductAffectedFixed
theopolis uefi-firmware-parser < 1.14 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI uefi-firmware <= 1.12 — GHSA-hm2w-vr2p-hq7w

References