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CVE-2026-54333: UEFI Firmware Parser may crash or be hijacked when handling crafted files
CVE-2026-54333 · published 28 days ago
Summary
The UEFI Firmware Parser tool (versions before 1.14) can mishandle specially crafted firmware data, causing it to write past the end of a small memory area. This can crash the program and, in some cases, let an attacker run their own code. Upgrade to version 1.14 or later to resolve the issue.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| theopolis | uefi-firmware-parser | < 1.14 |
Original advisory text
UEFI Firmware Parser: Stack out-of-bounds write in tiano decompressor MakeTable
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.
References
Internet-facing
3 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker full control
Type
CWE-787Out-of-bounds Write
Timeline
Published14 Sep 2026
Updated11 Oct 2026
First seen14 Sep 2026
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