Every CVE Search/ Get API key

CVE-2021-41945

Improper Input Validation in httpx

9.1 CriticalFix available

Encode OSS httpx < 0.23.0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

2.12%Up 1.2 points since Apr 29, 2022
90%50%10%1%

What each source reports

NVD Score used 9.1

Encode OSS httpx < 0.23.0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
CVE-2021-41945
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0
6.4 MediumAV:N/AC:L/Au:N/C:P/I:P/A:N
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

Encode OSS httpx < 0.23.0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
CVE-2021-41945
Updated
2026-11-02
EUVDEUVD-2022-0122 No score

Encode OSS httpx < 0.23.0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
EUVD-2022-0122
Updated
2026-11-02
GitHub AdvisoriesGHSA-h8pj-cxx2-jfg2 9.3

Improper Input Validation in httpx

Encode OSS httpx <=1.0.0.beta0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
GHSA-h8pj-cxx2-jfg2
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-20
Updated
2026-11-02
OSV 9.1

Encode OSS httpx < 0.23.0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
CVE-2021-41945
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2021-41945 9.1

Encode OSS httpx < 0.23.0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
DEBIAN-CVE-2021-41945
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
Show 6 moreShow less
OSVGHSA-h8pj-cxx2-jfg2 9.3

Improper Input Validation in httpx

Encode OSS httpx <=1.0.0.beta0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
GHSA-h8pj-cxx2-jfg2
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-20
Updated
2026-11-02
OSVUBUNTU-CVE-2021-41945 9.1

Encode OSS httpx < 0.23.0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
UBUNTU-CVE-2021-41945
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVCLSA-2025-1752797525 No score

TuxCare security update for httpx (1 CVE)

TuxCare rebuilt httpx to address 1 CVE. Fixed in 0.22.0.post1+tuxcare.

Record
CLSA-2025-1752797525
Updated
2026-11-02
OSVopenSUSE-SU-2024:12041-1 No score

python310-httpx-0.22.0-3.1 on GA media

These are all security issues fixed in the python310-httpx-0.22.0-3.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:12041-1
Updated
2026-11-02
OSVopenSUSE-SU-2025:14664-1 No score

python311-httpx-0.28.1-2.1 on GA media

These are all security issues fixed in the python311-httpx-0.28.1-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:14664-1
Updated
2026-11-02
OSVPYSEC-2022-183 No score

Encode OSS httpx <=1.0.0.beta0 is affected by improper input validation in httpx.URL, httpx.Client and some functions using httpx.URL.copy_with.

Record
PYSEC-2022-183
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
httpx
PyPI
 before 0.23.0
0.23.0
httpx
TuxCare:PyPI
 0.22.0 up to 0.22.0.post1+tuxcare
0.22.0.post1+tuxcare
httpx
Debian:12
 before 0.23.0-1
0.23.0-1
httpx
Debian:13
 before 0.23.0-1
0.23.0-1
httpx
Debian:14
 before 0.23.0-1
0.23.0-1
httpx
PyPI
 before 0.23.0, plus listed versions
0.0.10.10.00.10.10.11.00.11.1
Show 45 moreShow less
0.12.00.12.10.13.00.13.0.dev10.13.0.dev20.13.10.13.20.13.30.13.dev00.14.00.14.10.14.20.14.30.15.00.15.10.15.20.15.30.15.40.15.50.16.00.16.10.17.00.17.10.18.00.18.10.18.20.19.00.20.00.21.00.21.10.21.20.21.30.22.00.6.70.6.80.7.00.7.10.7.20.7.30.7.40.7.50.7.60.7.70.7.80.8.0
0.23.0
httpx
PyPI
 before 0.20.0, plus listed versions
0.0.10.10.00.10.10.11.00.11.1
Show 45 moreShow less
0.12.00.12.10.13.00.13.0.dev10.13.0.dev20.13.10.13.20.13.30.13.dev00.14.00.14.10.14.20.14.30.15.00.15.10.15.20.15.30.15.40.15.50.16.00.16.10.17.00.17.10.18.00.18.10.18.20.19.00.6.70.6.80.7.00.7.10.7.20.7.30.7.40.7.50.7.60.7.70.7.80.8.00.9.00.9.10.9.20.9.30.9.40.9.5
0.20.0
httpx
Ubuntu:24.04:LTS
 All versions, plus listed versions
0.23.3-10.26.0-10.26.0-2
 None known
httpx
Ubuntu:25.10
 All versions, plus listed versions
0.28.1-1
 None known
httpx
Ubuntu:26.10
 All versions, plus listed versions
0.28.1-1build10.28.1-1.10.28.1-2
 None known
httpx
Ubuntu:26.04:LTS
 All versions, plus listed versions
0.28.1-10.28.1-1build1
 None known
python-httpx
openSUSE:Tumbleweed
 before 0.28.1-2.1
0.28.1-2.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-41945 is a critical vulnerability (CVSS 9.1) in Encode Httpx, published April 28, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.12%, the 81st percentile. Fixed in httpx 0.23.0.

References

Show 11 moreShow less
This page doesn't list everything

Left out here: 6 versions. The JSON record has them.

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open