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No exploitation reportedFix available

CVE-2021-41945

No exploitation reported by the sources we read.

  • Published2022-04-28
  • Fixed in0.23.0 · 0.20.0
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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`.

Timeline

dates in UTC
  1. 2022-04-2814:15CVE publishedNVD

Versions per branch

NVD · OSV
Encode httpx
BranchAffectedFixed in
0.23< 0.23.00.23.0
0.20< 0.20.00.20.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • httpxUbuntu:26.10all versions · no fixed version listed
  • httpxUbuntu:26.04:LTSall versions · no fixed version listed
  • httpxUbuntu:25.10all versions · no fixed version listed
  • httpxUbuntu:24.04:LTSall versions · no fixed version listed
  • httpxTuxCare:PyPIfrom 0.22.0 · fixed in 0.22.0.post1+tuxcare
  • httpxDebian:14all versions · fixed in 0.23.0-1
  • httpxDebian:13all versions · fixed in 0.23.0-1
  • httpxDebian:12all versions · fixed in 0.23.0-1

1 more package range on OSV.dev

Full record on NVD

Fix

  1. Update Encode httpx to 0.23.0 · 0.20.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.19.1read 2026-10-23
  • NVDCVSS 2.06.4read 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score2.1 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryCRITICAL2022-04-29

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2022-04-28
Last Modified
2026-07-09
NVD status
Modified
GitHub Advisory
GHSA-h8pj-cxx2-jfg2

Frequently asked questions

What is CVE-2021-41945?

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`.

Is CVE-2021-41945 actively exploited?

Active exploitation of CVE-2021-41945 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41945?

CVE-2021-41945 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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Sources for this record