6.5 CVE-2026-80189

LeafWiki extracts an uploaded ZIP archive without limiting how much data it will write. ZipExtractor.ExtractToDir in internal/importer/zip_extractor.go opens each entry and copies it to the destination with io.Copy, which runs to the end of the decompressed stream, so only the size of the uploaded archive is bounded and the size it expands to is not. The import route that reaches this code requires the Editor or Admin role, and the upload itself is capped at 500 MiB compressed. Because a ZIP entry can compress at a very high ratio, an archive well inside that cap can expand to hundreds of gigabytes as it is written out. The extraction directory defaults to a location under the operating system temporary directory, so the written data consumes the disk backing that path, which on a tmpfs-backed temporary directory is memory. A user holding the Editor role can therefore exhaust the storage the service depends on and keep it from serving, using far more resource than the upload limit alone would permit.
https://nvd.nist.gov/vuln/detail/CVE-2026-80189

Categories

CWE-409 : Improper Handling of Highly Compressed Data (Data Amplification)
An example of data amplification is a "decompression bomb," a small ZIP file that can produce a large amount of data when it is decompressed.

References

 

AFFECTED (from MITRE)

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Vendor	Product	Versions
perber	leafwiki	0.10.0 < 0.12.1 [affected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe	start	end

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REMEDIATION

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EXPLOITS

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Exploit-db.com

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No known exploits

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POC Github

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Other Nist (github, ...)

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CAPEC

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Common Attack Pattern Enumerations and Classifications

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