CVE-2026-104843
uv: Path traversal on Windows through wheel extraction
uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Active
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
uv: Path traversal on Windows through wheel extraction
uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.
- Record
CVE-2026-104843- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-22
- Updated
- 2026-11-02
EUVDEUVD-2026-91675
uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.
- Record
EUVD-2026-91675- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-2cv4-cqwr-gwf7
uv: Path traversal on Windows through wheel extraction
Impact
In versions of uv from 0.12.7 to 0.12.18 on Windows, uv could be induced into writing a file outside of the installation prefix during wheel installation.
A malicious wheel could use this to place an executable outside of the intended environment, including in a directory already present on the user's PATH.
This vulnerability only affects Windows hosts; no other platforms are affected.
Patches
uv 0.12.18 and newer address this vulnerability. Users are encouraged to upgrade to 0.12.18.
Workarounds
There is no workaround other than upgrading to uv 0.12.18.
- Record
GHSA-2cv4-cqwr-gwf7- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-22
- Updated
- 2026-11-02
NVD
uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.
- Record
CVE-2026-104843- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-22
- Updated
- 2026-11-02
OSV
uv: Path traversal on Windows through wheel extraction
uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.
- Record
CVE-2026-104843- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-22
- Updated
- 2026-11-02
OSVGHSA-2cv4-cqwr-gwf7
uv: Path traversal on Windows through wheel extraction
Impact
In versions of uv from 0.12.7 to 0.12.18 on Windows, uv could be induced into writing a file outside of the installation prefix during wheel installation.
A malicious wheel could use this to place an executable outside of the intended environment, including in a directory already present on the user's PATH.
This vulnerability only affects Windows hosts; no other platforms are affected.
Patches
uv 0.12.18 and newer address this vulnerability. Users are encouraged to upgrade to 0.12.18.
Workarounds
There is no workaround other than upgrading to uv 0.12.18.
- Record
GHSA-2cv4-cqwr-gwf7- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-22
- Updated
- 2026-11-02
OSVPYSEC-2026-4305
uv: Path traversal on Windows through wheel extraction
Impact
In versions of uv from 0.12.7 to 0.12.18 on Windows, uv could be induced into writing a file outside of the installation prefix during wheel installation.
A malicious wheel could use this to place an executable outside of the intended environment, including in a directory already present on the user's PATH.
This vulnerability only affects Windows hosts; no other platforms are affected.
Patches
uv 0.12.18 and newer address this vulnerability. Users are encouraged to upgrade to 0.12.18.
Workarounds
There is no workaround other than upgrading to uv 0.12.18.
- Record
PYSEC-2026-4305- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-104843
uv is a Python package and project manager written in Rust. From 0.12.7 until 0.12.18, uv wheel extraction on Windows can process a malicious wheel in a way that writes a file outside the installation prefix, including an executable in a directory already present on the user's PATH. Non-Windows hosts are not affected. This issue is fixed in version 0.12.18.
- Record
UBUNTU-CVE-2026-104843- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
uvPyPI |
0.12.7 up to 0.12.18 | 0.12.18 |
uvcrates.io |
0.12.7 up to 0.12.18 | 0.12.18 |
uvPyPI |
0.12.7 up to 0.12.18, plus listed versions 0.12.100.12.110.12.120.12.130.12.14 Show 5 moreShow less0.12.150.12.160.12.170.12.80.12.9 |
0.12.18 |
uvUbuntu:26.10 |
All versions, plus listed versions 0.9.17+ds1-30.9.17+ds1-40.9.17+ds1-50.9.17+ds1-6 |
None known |
uv-fullUbuntu:26.10 |
All versions, plus listed versions 0.11.20+ds-0ubuntu1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-104843 is a medium vulnerability (CVSS 5.9) in Astral-sh Uv, published October 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in uv 0.12.18.