CVE-2026-48092

7-Zip SquashFS Fragment Offset Overflow (GHSL-2026-116)

Published Jun 5, 2026 CVSS 3.1 · 4.3 Medium EPSS 2.7% KEV · Not listed
Description
7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain a heap memory disclosure via SquashFS fragment offset integer overflow on 32-bit builds. 32-bit integer overflow in the SquashFS ReadBlock function allows an attacker-controlled node.Offset value to bypass the fragment bounds check, causing memcpy to read heap memory preceding the cache buffer into the extracted file. The vulnerability is exploitable only on 32-bit builds of 7-Zip where size_t is 32 bits, allowing the addition offsetInBlock + blockSize to wrap modulo 2³². On 64-bit builds the addition is promoted to 64 bits and the check correctly rejects the input. Version 26.01 patches the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4681-1 p7zip security update
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared 7-zip
7-zip 7-zip
CPEs cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:*
Vendors & Products 7-zip
7-zip 7-zip
Type Values Removed Values Added
First Time appeared Mcmilk
Mcmilk 7-zip
Vendors & Products Mcmilk
Mcmilk 7-zip
Type Values Removed Values Added
Description 7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain a heap memory disclosure via SquashFS fragment offset integer overflow on 32-bit builds. 32-bit integer overflow in the SquashFS ReadBlock function allows an attacker-controlled node.Offset value to bypass the fragment bounds check, causing memcpy to read heap memory preceding the cache buffer into the extracted file. The vulnerability is exploitable only on 32-bit builds of 7-Zip where size_t is 32 bits, allowing the addition offsetInBlock + blockSize to wrap modulo 2³². On 64-bit builds the addition is promoted to 64 bits and the check correctly rejects the input. Version 26.01 patches the issue.
Title 7-Zip SquashFS Fragment Offset Overflow (GHSL-2026-116)
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 8, 2026, 5:08 PM
Reserved
May 20, 2026, 6:40 PM
Status
Modified
Published
Jun 5, 2026, 3:16 PM
Modified
Jun 17, 2026, 10:54 AM