Description
adm-zip through 0.6.1 contains a duplicate-entry validation bypass that allows attackers to evade the readEntries() check by using canonically equivalent entry names like './hello.txt' and 'hello.txt'. Attackers can craft ZIP archives where getEntry() or readAsText() validates benign content while extractAllTo() writes malicious content to the same path, bypassing integrity checks.
References6
- github.com/cthackers/adm-zip
- github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997c…
- github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997c…
- github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997c…
- github.com/cthackers/adm-zip/issues/587
- www.vulncheck.com/advisories/adm-zip-through-0.6.1-duplicate-en…
Metrics
- CVSS 3.1
-
3.7
LOW
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N - CVSS 4.0
-
6.3
MEDIUM
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 18 · as of 8 November 2026
- CWE
- CWE-436
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.