CVE-2026-48104 GHSL-2026-120: 7-Zip SquashFS BlockToNode uninitialized heap read

7-Zip is a file archiver with a high compression ratio. Versions 9.18 through 26.00 contain an uninitialized heap read in the SquashFS archive handler caused by a sparsely populated index array. In the SquashFS handler, blockToNode is allocated with capacity for every metadata block but populated...

CVE-2026-48104

7-Zip (versions 9.18–26.00) contains an uninitialized heap read in the SquashFS archive handler. A sparsely populated index array causes _blockToNode to be allocated for all metadata blocks but only populated when an inode crosses a block boundary; images with few inodes spanning many blocks leav...