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CVE-2024-49766

Werkzeug safe_join not safe on Windows

6.3 MediumFix available

Werkzeug is a Web Server Gateway Interface web application library. On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable. Werkzeug version 3.0.6 contains a patch.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.78%Up 0.7 points since Oct 26, 2024
90%50%10%1%

What each source reports

CVE List Score used 6.3

Werkzeug safe_join not safe on Windows

Werkzeug is a Web Server Gateway Interface web application library. On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable. Werkzeug version 3.0.6 contains a patch.

Record
CVE-2024-49766
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-22
Updated
2026-11-02
EUVDEUVD-2024-3031 6.3

Werkzeug is a Web Server Gateway Interface web application library. On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable. Werkzeug version 3.0.6 contains a patch.

Record
EUVD-2024-3031
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-f9vj-2wh5-fj8j 6.3

Werkzeug safe_join not safe on Windows

On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable.

Record
GHSA-f9vj-2wh5-fj8j
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-22
Updated
2026-11-02
NVD 6.3

Werkzeug is a Web Server Gateway Interface web application library. On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable. Werkzeug version 3.0.6 contains a patch.

Record
CVE-2024-49766
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/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
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
OSVBELL-CVE-2024-49766 5.3

CVE-2024-49766 does not affect BellSoft software

Record
BELL-CVE-2024-49766
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSV 6.3

Werkzeug safe_join not safe on Windows

Werkzeug is a Web Server Gateway Interface web application library. On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable. Werkzeug version 3.0.6 contains a patch.

Record
CVE-2024-49766
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-22
Updated
2026-11-02
Show 6 moreShow less
OSVGHSA-f9vj-2wh5-fj8j 6.3

Werkzeug safe_join not safe on Windows

On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable.

Record
GHSA-f9vj-2wh5-fj8j
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-22
Updated
2026-11-02
OSVPYSEC-2026-2045 6.3

Werkzeug safe_join not safe on Windows

On Python < 3.11 on Windows, os.path.isabs() does not catch UNC paths like //server/share. Werkzeug's safe_join() relies on this check, and so can produce a path that is not safe, potentially allowing unintended access to data. Applications using Python >= 3.11, or not using Windows, are not vulnerable.

Record
PYSEC-2026-2045
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVROOT-APP-PYPI-CVE-2024-49766 5.3

CVE-2024-49766 in rootio-Werkzeug - Patched by Root

Root has patched CVE-2024-49766 in the rootio-Werkzeug package for Root:PyPI. Multiple fixed versions available.

Record
ROOT-APP-PYPI-CVE-2024-49766
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVCLSA-2026-1772410262 No score

TuxCare security update for werkzeug (3 CVEs)

TuxCare rebuilt werkzeug to address 3 CVEs. Fixed in 1.0.1.post1+tuxcare.

Record
CLSA-2026-1772410262
Updated
2026-11-02
OSVCLSA-2026-1772583181 No score

TuxCare security update for werkzeug (2 CVEs)

TuxCare rebuilt werkzeug to address 2 CVEs. Fixed in 2.2.3.post3+tuxcare.

Record
CLSA-2026-1772583181
Updated
2026-11-02
OSVCLSA-2026-1789453348 No score

TuxCare security update for werkzeug (4 CVEs)

TuxCare rebuilt werkzeug to address 4 CVEs. Fixed in 2.3.8.post3+tuxcare.

Record
CLSA-2026-1789453348
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
werkzeug
PyPI
 through 3.0.5
3.0.6
werkzeug
TuxCare:PyPI
From an advisory covering 3 CVEs
 1.0.1 up to 1.0.1.post1+tuxcare
1.0.1.post1+tuxcare
werkzeug
TuxCare:PyPI
From an advisory covering 2 CVEs
 2.2.3 up to 2.2.3.post3+tuxcare, plus listed versions
2.2.3.post1+tuxcare
2.2.3.post3+tuxcare
werkzeug
TuxCare:PyPI
From an advisory covering 4 CVEs
 2.3.8 up to 2.3.8.post3+tuxcare, plus listed versions
2.3.8.post1+tuxcare2.3.8.post2+tuxcare
2.3.8.post3+tuxcare
werkzeug
PyPI
 before 3.0.6, plus listed versions
0.10.100.10.10.10.20.10.3
Show 45 moreShow less
0.10.40.110.11.10.11.100.11.110.11.120.11.130.11.140.11.150.11.20.11.30.11.40.11.50.11.60.11.70.11.80.11.90.120.12.10.12.20.130.140.14.10.15.00.15.10.15.20.15.30.15.40.15.50.15.60.16.00.16.10.20.30.3.10.40.4.10.50.5.10.60.6.10.6.20.70.7.10.7.2
3.0.6
rootio-Werkzeug
Root:PyPI
 before 2.3.7+root.io.2
2.3.7+root.io.22.3.7+root.io.32.3.7+root.io.42.3.7+root.io.52.3.7+root.io.6
Werkzeug
Root:PyPI
 before 2.3.7+aikido.6
2.3.7+aikido.6

History

History
RecordedChangedSources
affected, facts
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-49766 is a medium vulnerability (CVSS 6.3) in Pallets Werkzeug, published October 25, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.78%, the 56th percentile. Fixed in werkzeug 3.0.6.

References

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Left out here: 46 versions. The JSON record has them.

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