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

Quick assessment

Affected
theopolis uefi-firmware-parser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

UEFI 固件解析器（UEFI Firmware Parser）用于解析 BIOS、Intel ME 以及 UEFI 固件的结构，包括卷、文件系统和文件等。在版本 1.14 之前，位于 中的 函数未对从特制的 Tiano 或 EFI 压缩固件比特流中读取的位长度值进行有效范围校验，即未确保其落在预期的 0 到 16 的范围内。因此，标准的解析路径 → → → → 可能会向栈上分配的 数组及相关解码表之外写入数据，导致栈内存破坏。这种破坏会确定性地导致解析进程崩溃，并且在特定编译和运行环境细节下，还可能允许执行任意代

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-54333

Vulnerability Information
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Vulnerability Title
UEFI Firmware Parser: Stack out-of-bounds write in tiano decompressor MakeTable
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
theopolis uefi-firmware-parser < 1.14 -

II. Public POCs for CVE-2026-54333

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III. Intelligence Information for CVE-2026-54333

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Patches & Fixes for CVE-2026-54333 (1)

Vendor Advisories for CVE-2026-54333 (1)

Other References for CVE-2026-54333 (1)

IV. Related Vulnerabilities

Same product: uefi-firmware-parser
Same vendor: theopolis
Same weakness: CWE-787

V. Comments for CVE-2026-54333

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