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CVE-2026-48092 is a heap memory disclosure vulnerability in 7-Zip’s SquashFS handler affecting 32-bit builds. In the SquashFS ReadBlock function, an attacker-controlled fragment node offset can trigger a 32-bit integer overflow when computing the fragment boundary check using offsetInBlock plus blockSize. Because the arithmetic wraps on platforms where size_t is 32 bits, the bounds validation can be bypassed. This allows a subsequent memcpy operation to read heap memory located before the cache buffer and copy that unintended data into the extracted output. The issue affects 7-Zip versions 9.34 through 26.00 according to the vulnerability description, and broader reporting indicates affected 32-bit versions date back to 9.18. The flaw does not affect 64-bit builds because the addition is promoted to 64-bit arithmetic and the malformed input is rejected correctly.
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Cross-references every affected SKU, including bundled OEM variants.
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