Vulnerability in golang.org/x/net (CVE-2021-33194)
Summary
Vulnerability in golang.org/x/net (CVE-2021-33194). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
Go through 1.15.12 and 1.16.x through 1.16.4 has a golang.org/x/net/html infinite loop via crafted ParseFragment input.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2021-33194 has been found in golang.org/x/net.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "golang.org/x/net CVE-2021-33194" on the vendor's site.
CVE-2021-33194 (golang.org/x/net)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
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 (unclassified) exists in golang.org/x/net.
Check the vendor advisory for the affected versions of golang.org/x/net.
Severity: ?. Risk of unauthorized operations or information disclosure.
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 'golang.org/x/net' . 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 'golang.org/x/net' . | 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
golang.org/x/net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。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2021-33194 golang-golang-x-net Fixed in: 1:0.0+git20210119.5f4716e+dfsg-4
References
- advisory nvd.nist.gov
- web lists.fedoraproject.org
- web groups.google.com
- web github.com
- web go.dev
- web go.dev
- web go.googlesource.com
- web lists.fedoraproject.org
- web pkg.go.dev