CVE-2026-48111
Published: June 5th, 2026
7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an off-by-one out-of-bounds read vulnerability in the ParseDepedencyExpression function of the UEFI firmware image parser(CPP/7zip/Archive/UefiHandler.cpp). The function validates an attacker-controlled opcode byte using > instead of >= against the element count of the 10-entry kExpressionCommands static array, allowing an opcode value of 10 to read one pointer slot (8 bytes on x64) past the end of the array in .rodata. The out-of-bounds value is then dereferenced as a const char * and passed through strlen and memcpy into the archive's Characts property, which may cause either a denial of service (access violation when the adjacent bytes do not form a valid readable pointer) or a minor information disclosure of an adjacent .rdata string literal into archive metadata. The vulnerability is reached automatically during IInArchive::Open() via the call path OpenFv/OpenCapsule → ParseVolume → ParseSections when processing a SECTION_DXE_DEPEX (0x13) or SECTION_PEI_DEPEX (0x1B) section whose first body byte is 0x0A, and the UEFI handler is enabled by default in stock 7z.dll with signature-based detection for both UEFIc and UEFIf formats. The outcome (crash vs. silent leak) is deterministic per build but linker-layout dependent, with no write primitive and no disclosure of heap data, secrets, or ASLR base addresses. Version 26.01 fixes the issue.
MEDIUM
CVSS v3: 4.3
CVSS v3: 4.3
Status
| DocFilters Release | Package | State | Justification | Comment |
|---|---|---|---|---|
| 26.3 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 26.2 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 26.1 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 25.4 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 25.3 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 25.2 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 25.1 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 24.4 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 24.4.0 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 24.3 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 24.2 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 24.1 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 23.3 | 7-zip (23.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 23.2 | 7-zip (17.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 23.1 | 7-zip (17.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
| 22.4 | 7-zip (17.01) | Not Affected | Code Not Present | The vulnerability exists in the UEFI firmware image handler (ParseDepedencyExpression / kExpressionCommands in UefiHandler.cpp), which parses UEFIc and UEFIf firmware volumes and is part of the full 7-Zip application, not the LZMA SDK. Document Filters consumes LZMA SDK 23.01, whose Archive directory ships only the 7z, LZMA, XZ, and Split handlers; UefiHandler.cpp does not exist in the SDK distribution and is not included in the Document Filters build source list (external/CMakeLists.txt, which compiles only the 7z, LZMA, and XZ handlers). The vulnerable ParseDepedencyExpression function is therefore never compiled or reachable. |
Severity score breakdown
Attack Complexity
LOW
Attack Vector
NETWORK
Availability Impact
LOW
Base Score
4.3
Base Severity
MEDIUM
Confidentiality Impact
NONE
Integrity Impact
NONE
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
REQUIRED
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Version
3.1