CVE-2026-48101
GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure
Description
7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.
INFO
Published Date :
June 5, 2026, 4:16 p.m.
Last Modified :
June 11, 2026, 6:02 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update 7-Zip to version 26.0.1 or later.
- Verify the installed 7-Zip version.
- Apply patches if available for older versions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-48101.
| URL | Resource |
|---|---|
| https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/ | Exploit Patch Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48101 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-48101
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48101 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48101 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Reanalysis by [email protected]
Jun. 11, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:* versions from (including) 9.21 up to (including) 26.01 OR *cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:* versions from (including) 9.21 up to (excluding) 26.01 -
Initial Analysis by [email protected]
Jun. 08, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:* versions from (including) 9.21 up to (including) 26.01 Added Reference Type GitHub, Inc.: https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/ Types: Exploit, Patch, Third Party Advisory -
New CVE Received by [email protected]
Jun. 05, 2026
Action Type Old Value New Value Added Description 7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Added CWE CWE-908 Added Reference https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/