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.
CVE-2026-80189
This medium-severity CVE scores 6.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(low)
- EG Risk
- 34(Track)EG Risk 34/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity65% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
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- EPSS %ILE
- —
- KEV
- Not listed
Published
August 25, 2026
Last Modified
August 25, 2026
Advisory Details (5)
Auto-updated Aug 25, 2026LeafWiki 0.10.0 through 0.12.0 Uncontrolled Resource Consumption via Unbounded ZIP Extraction | Advisories | VulnCheck
https://www.vulncheck.com/advisories/leafwiki-0.10.0-through-0.12.0-uncontrolled-resource-consumption-via-unbounded-zip-extractionLeafWiki v0.12.1
Patch available: perber/leafwiki v0.12.1
https://github.com/perber/leafwiki/releases/tag/v0.12.1leafwiki/internal/importer/zip_extractor.go at v0.12.0 · perber/leafwiki · GitHub
https://github.com/perber/leafwiki/blob/v0.12.0/internal/importer/zip_extractor.goUnbounded decompression in ZIP importer allows disk/RAM exhaustion (zip bomb) · Advisory · perber/leafwiki · GitHub
https://github.com/perber/leafwiki/security/advisories/GHSA-258m-crqp-25xcGitHub - perber/leafwiki: LeafWiki - Self-hosted wiki. Single Go binary, SQLite, Markdown on disk. No external database required. · GitHub
https://github.com/perber/leafwikiWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-25 23:25 UTCEG score recompute
- 2026-08-25 23:24 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-80189?
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Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-80189
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