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[GHSA] GHSA-7q85-xj36-vmfc (high) — adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS)

highgithub_advisoriesPublished 2026-09-18

GHSA-7q85-xj36-vmfc Severity: high CVE: CVE-2026-77301

adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS)

### Summary adm-zip allocates an entry's output buffer from the declared uncompressed size (central-directory `size` field) before validating it against the actual data. A tiny crafted ZIP that declares a huge uncompressed size forces a multi-gigabyte allocation

MITRE ATT&CK techniques

Indicators of compromise

Original source: https://github.com/advisories/GHSA-7q85-xj36-vmfc