Vulnerability in Encode (CVE-2021-41945)
Summary
Vulnerability in Encode (CVE-2021-41945). Confidential information can be exposed externally. Exploitable via httpx.URL.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2021-41945 has been found in Encode.
Attackers can target a specific entry point like httpx.URL over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 9.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Encode CVE-2021-41945" on the vendor's site.
CVE-2021-41945 (Encode) — CWE-20 / CVSS v3 9.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: httpx.URL / httpx.Client / httpx.URL.copy_with
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-20) exists in Encode. Attackers reach the vulnerable code path via httpx.URL without authentication.
Check the vendor advisory for the affected versions of Encode. Attack surface: httpx.URL / httpx.Client / httpx.URL.copy_with.
Severity: Critical (CVSS 9.1/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Encode' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Encode' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Encodeを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2021-41945 httpx Fixed in: 0.23.0-1
- Ubuntu UBUNTU-CVE-2021-41945 httpx
References
- advisory github.com
- package github.com
- patch encode.com
- report gist.github.com
- report github.com
- report github.com