UEFI Firmware Parser: Stack out-of-bounds write in tiano decompressor MakeTable

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54333
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 20:16:45 UTC
Updated2026-09-30 17:51:56 UTC
DescriptionUEFI 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.008010000 probability, percentile 0.549050000 (date 2026-09-29)

Problem Types: CWE-787 | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Theopolis Uefi-firmware-parser affected < 1.14 Not specified

References

ReferenceSourceLinkTags
github.com/theopolis/uefi-firmware-parser/releases/tag/v1.14 [email protected] github.com
github.com/theopolis/uefi-firmware-parser/commit/bf3dfaa8a05675bae6ea0cb... [email protected] github.com
github.com/theopolis/uefi-firmware-parser/pull/145 [email protected] github.com
github.com/theopolis/uefi-firmware-parser/security/advisories/GHSA-2689-... [email protected] github.com
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