Vulnerability in Cthackers Adm-Zip
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/cthackers/adm-zip/issues/587 (issue-tracking)
- github.com/cthackers/adm-zip (product)
- github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/zipF… (technical-description)
- github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/adm-… (technical-description)
- github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/util… (technical-description)
- www.vulncheck.com/advisories/adm-zip-through-0.6.1-duplicate-entry-validation-b… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116137?
- CVE-2026-116137 is a low-severity vulnerability in Cthackers Adm-Zip, classified under CWE-436. CVSS score: 3.7/10. Published 2026-10-25.
- How severe is CVE-2026-116137?
- Low severity. CVSS v3 base score is 3.7 out of 10.