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pip has an interpretation conflict due to handling both concatenated tar and ZIP files as ZIP files

🗓️ 20 Apr 2026 18:31:48Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 10 Views

Pip now only installs when a file uniquely identifies as a zip archive or tar archive.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Unrestricted upload of file with dangerous type, improper certificate validation, and other vulnerabilities might affect IBM Storage Defender - Resiliency Service
24 Jun 202616:05
–ibm
ATTACKERKB		CVE-2026-3219
20 Apr 202614:55
–attackerkb
Tenable Nessus		Amazon Linux 2023 : python3.11-pip, python3.11-pip-wheel (ALAS2023-2026-1665)
20 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.12-pip, python3.12-pip-wheel (ALAS2023-2026-1666)
20 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.14-pip, python3.14-pip-wheel (ALAS2023-2026-1718)
26 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.13-pip, python3.13-pip-wheel (ALAS2023-2026-1719)
27 May 202600:00
–nessus
Tenable Nessus		Fedora 44 : pypy (2026-130f7539d3)
17 May 202600:00
–nessus
Tenable Nessus		Fedora 44 : python3.15 (2026-2ee2d7abd5)
25 May 202600:00
–nessus
Tenable Nessus		Fedora 43 : pypy (2026-3505a95524)
16 May 202600:00
–nessus
Tenable Nessus		Fedora 45 : pypy (2026-b58cd376d6)
8 May 202600:00
–nessus
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Vulners
Node
pypapipRange≤26.0.1pip

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20 May 2026 20:54Current
5.2Medium risk
Vulners AI Score5.2
CVSS 44.6
EPSS0.00144
SSVC
CWE-434
zip archivetar archivearchive format detectiondual format ambiguity
10