pip can extract console_scripts and gui_scripts outside installation directory (CVE-2026-8643)

What is affected, what to do

A flaw was found in pip, the package installer for Python. A remote attacker can exploit this vulnerability by tricking a victim into installing a malicious Python wheel.

Update Python Packaging Authority Pip to version 26.1.2.

Affected

• Python Packaging Authority Pip lt 24.0..26.1.2

Fixed in

• Python Packaging Authority Pip 26.1.2

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2

NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

Read in glossary

High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.

CRA

The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

Read in glossary

From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.

ISO/IEC 27001

ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

Read in glossary

Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in pip, the package installer for Python. A remote attacker can exploit this vulnerability by tricking a victim into installing a malicious Python wheel. This wheel contains specially crafted entry-point names that use directory traversal or absolute paths. This allows pip to write generated script wrappers outside the intended installation directory, leading to arbitrary file overwrite. This can severely impact system integrity and availability, and in certain scenarios, may lead to arbitrary code execution.

Source: redhat_csaf, suse_csaf, BSI WID Portal, BSI CSAF, OSV (Open Source Vulnerabilities), Microsoft Security Update Guide, NVD (NIST), CVE.org (MITRE), cvelistv5

Vendors and products

• IBM App Connect Enterprise Cd
• IBM App Connect Enterprise Lts
• Oracle Communications
• Oracle Oracle Solaris Operating System
• Pypa PyPA pip
• Python Packaging Authority Pip
• Red Hat Enterprise Linux

Weakness classes (CWE)

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

  Base

  The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

  Entry at MITRE CWE-22

References & sources

• NVD (NIST)vuln/detail/CVE-2026-8643advisory
• github.compypa/pip/pull/14000web, Patch
• access.redhat.comerrata/RHSA-2026:33313web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:34776web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:34777web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:34778web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:34780web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:34891web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:36193web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:36315web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:37275web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:37283web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comsecurity/cve/CVE-2026-8643web, Vulnerability database, x_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2460927web, Issue tracking, x_refsource_REDHAT
• github.compypa/advisory-database/tree/main/vulns/pip/PYSEC-2026-196.yamlweb
• github.compypa/pippackage
• mail.python.orgarchives/list/security-announce@python.org/thread/YV63UET5D3OOJ…web
• security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-8643.jsonweb, x_sadp-csaf-vex
• access.redhat.comerrata/RHSA-2026:34374web, Vendor advisory, x_refsource_REDHAT
• access.redhat.comerrata/RHSA-2026:34456web, Vendor advisory, x_refsource_REDHAT

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

1. 16.09.2026Record modifiedRed Hat ADP

   1 individual change: Affected versions (publisher)

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/8xxx/CVE-2026-8643.json">CVE-2026-8643</a>

   Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

2. 14.09.2026Record modifiedRed Hat ADP

   1 individual change: Affected versions (publisher)

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/8xxx/CVE-2026-8643.json">CVE-2026-8643</a>

   Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

3. 09.09.2026Record modifiedRed Hat ADP

   1 individual change: Affected versions (publisher)

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/8xxx/CVE-2026-8643.json">CVE-2026-8643</a>

   Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

4. 07.09.2026Record modifiedRed Hat ADP

   1 individual change: Affected versions (publisher)

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/8xxx/CVE-2026-8643.json">CVE-2026-8643</a>

   Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

5. 28.08.2026Record modifiedpython.org

   New references:

   • https://github.com/pypa/pip/pull/14000
   • https://mail.python.org/archives/list/security-announce@python.org/thread/YV63UET5D3OOJY7O4M5XCVYO2YM4NBYJ/
   Show 6 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Reference	added	—	https://github.com/pypa/pip/pull/14000
   Reference	added	—	https://mail.python.org/archives/list/security-announce@python.org/thread/YV63UET5D3OOJY7O4M5XCVYO2YM4NBYJ/
   Reference	removed	https://github.com/pypa/pip/pull/14000	—
   Reference	removed	https://mail.python.org/archives/list/security-announce@python.org/thread/YV63UET5D3OOJY7O4M5XCVYO2YM4NBYJ/	—
   Reference type	removed	https://github.com/pypa/pip/pull/14000 Types: Issue Tracking, Patch	—
   Reference type	removed	https://mail.python.org/archives/list/security-announce@python.org/thread/YV63UET5D3OOJY7O4M5XCVYO2YM4NBYJ/ Types: Mailing List, Vendor Advisory	—

   Source identifier: cna@python.org

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