AIKIDO-2026-652849
adm-zip is vulnerable to Interpretation Conflict
59
Medium Risk
This Affects:
adm-zipTL;DR
adm-zip keeps every entry of a zip that contains duplicate entry names in its internal list, but its name lookup table retains only the last one. As a result getEntry() returns different content than extractAllTo() writes to disk for the same name. Security checks that validate an entry before extraction can be bypassed, because the validated bytes are not the extracted bytes. The fix rejects archives that contain duplicate entry names.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you inspect archive entries before extraction to enforce a security policy.
Background info
adm-zip is vulnerable to Interpretation Conflict in versions 0.0.1 - 0.6.0.
How to fix this
Upgrade the adm-zip library to the patch version.
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