CVE-2026-116137

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.

CVSS 4.0

6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE

CWE-436

Published

2026-10-25

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://github.com/cthackers/adm-zip
• https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/adm-zip.js#L87
• https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/util/utils.js#L383
• https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/zipFile.js#L81-L92
• https://github.com/cthackers/adm-zip/issues/587

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