CVE-2026-6357: Vulnerability in Pip maintainers pip
CVE-2026-6357 is a medium severity vulnerability in pip versions prior to 26.1. The issue involves pip running its self-update check after installing wheel files, which requires importing well-known Python modules. This import was deferred to improve startup time but could lead to unintended module imports shortly after installation. The patch changes the self-update check to run before wheel installation to prevent this behavior. Users are advised to review package contents before installation. No known exploits are reported, and no official patch or remediation level is explicitly stated in the advisory.
AI Analysis
Technical Summary
This vulnerability in pip prior to version 26.1 arises because the self-update check functionality runs after wheel files are installed, requiring the import of well-known Python modules. These imports were deferred to optimize CLI startup time. The patch modifies the process to run the self-update check before wheel installation, preventing newly installed modules from being imported immediately after installation. The vulnerability is categorized under CWE-829 (Inclusion of Functionality from Untrusted Control Sphere).
Potential Impact
The vulnerability could lead to unintended execution of newly installed modules during the self-update check phase, potentially affecting the integrity of the pip environment. The CVSS 4.0 score is 5.3 (medium severity), indicating a limited attack vector (local), requiring privileges and user interaction, with high impact on confidentiality and integrity. There are no known exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should upgrade to pip version 26.1 or later once available. Meanwhile, it is recommended to carefully review the contents of packages before installation to mitigate risks associated with this vulnerability.
CVE-2026-6357: Vulnerability in Pip maintainers pip
Description
CVE-2026-6357 is a medium severity vulnerability in pip versions prior to 26.1. The issue involves pip running its self-update check after installing wheel files, which requires importing well-known Python modules. This import was deferred to improve startup time but could lead to unintended module imports shortly after installation. The patch changes the self-update check to run before wheel installation to prevent this behavior. Users are advised to review package contents before installation. No known exploits are reported, and no official patch or remediation level is explicitly stated in the advisory.
CVSS v4.0
Score 5.3medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in pip prior to version 26.1 arises because the self-update check functionality runs after wheel files are installed, requiring the import of well-known Python modules. These imports were deferred to optimize CLI startup time. The patch modifies the process to run the self-update check before wheel installation, preventing newly installed modules from being imported immediately after installation. The vulnerability is categorized under CWE-829 (Inclusion of Functionality from Untrusted Control Sphere).
Potential Impact
The vulnerability could lead to unintended execution of newly installed modules during the self-update check phase, potentially affecting the integrity of the pip environment. The CVSS 4.0 score is 5.3 (medium severity), indicating a limited attack vector (local), requiring privileges and user interaction, with high impact on confidentiality and integrity. There are no known exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should upgrade to pip version 26.1 or later once available. Meanwhile, it is recommended to carefully review the contents of packages before installation to mitigate risks associated with this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- PSF
- Date Reserved
- 2026-04-15T13:55:02.734Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69ef79fcba26a39fba368ba9
Added to database: 4/27/2026, 3:00:12 PM
Last enriched: 6/3/2026, 9:18:56 PM
Last updated: 6/11/2026, 6:27:11 PM
Views: 160
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