CVE-2026-48092: 7-Zip

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• 7-Zip 7-Zip: from 9.34, before 26.01 (fixed in 26.01)

Published 2026-06-05. Last modified 2026-06-17.