Medium 4.6Published Apr 20, 2026

CVE-2026-3219pip doesn't reject concatenated ZIP and tar archives

Updated under an hour ago (Oct 26, 2026, 12:23 PM ET)

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It affects Python Packaging Authority pip. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Python Packaging Authority pip

Exploited in the last 30 days

pip handles concatenated tar and ZIP files as ZIP files regardless of filename or whether a file is both a tar and ZIP file. This behavior could result in confusing installation behavior, such as installing "incorrect" files according to the filename of the archive. New behavior only proceeds with installation if the file identifies uniquely as a ZIP or tar archive, not as both.

CVSS: 4.6 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-434
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: PSF
NVD analysis: Awaiting Analysis
Record last updated: Apr 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Python Packaging Authority pip python_packaging_authority:pip (from the name)	before 26.1	CNA record

References

https://github.com/pypa/pip/pull/13870patch
https://mail.python.org/archives/list/security-announce@python.org/thread/QAJ5JIVWWCAJ4EZL2FP5MOOW35JS7LRJ/vendor-advisory
http://www.openwall.com/lists/oss-security/2026/04/20/8

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.