CVE-2026-104086
Published: October 14th, 2026
7-Zip before 26.03 contains an uninitialized memory disclosure vulnerability in the SquashFS v4 archive handler (SquashfsHandler.cpp) that allows attackers to leak heap memory by crafting a malicious archive where the superblock’s no_ids field is set so that the final metadata block’s expected size is miscomputed and bypasses the size validation check. By listing or extracting the crafted archive, attackers can cause the application to return uninitialized heap memory as the kpidUserId and kpidGroupId properties, exposing potentially sensitive process memory contents to the user.
MEDIUM
CVSS v3: 5.5
CVSS v3: 5.5
Status
| DocFilters Release | Package | State | Justification | Comment |
|---|---|---|---|---|
| daily | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 26.3 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 26.2 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 26.1 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 25.4 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 25.3 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 25.2 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 25.1 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 24.4 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 24.4.0 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 24.3 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 24.2 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 24.1 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 23.3 | 7-zip (23.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 23.2 | 7-zip (17.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 23.1 | 7-zip (17.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
| 22.4 | 7-zip (17.01) | Not Affected | Code Not Present | The flaw is in the SquashFS handler (SquashfsHandler.cpp) of the full 7-Zip application, which is not part of the LZMA SDK that Document Filters uses. |
Severity score breakdown
Attack Complexity
LOW
Attack Vector
LOCAL
Availability Impact
NONE
Base Score
5.5
Base Severity
MEDIUM
Confidentiality Impact
HIGH
Integrity Impact
NONE
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
REQUIRED
Vector String
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Version
3.1