Vulnerability in github.com/kcp-dev/kcp (CVE-2026-39429)
Summary
Vulnerability in github.com/kcp-dev/kcp (CVE-2026-39429). Confidential information can be exposed externally. Mitigation: upgrade to 0.29.3, 0.30.3 or later.
Original description
The description as published by the source.
kcp's cache server is accessible without authentication or authorization checks in github.com/kcp-dev/kcp
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-2026-39429 has been found in github.com/kcp-dev/kcp.
Confidential information can be exposed externally. CVSS score: 8.2/10.
What to do: upgrade github.com/kcp-dev/kcp to 0.29.3, 0.30.3 or later.
If unsure, ask your IT team or search "github.com/kcp-dev/kcp CVE-2026-39429" on the vendor's site.
CVE-2026-39429 (github.com/kcp-dev/kcp) — CWE-302 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 0.29.3, 0.30.3 — apply immediately
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-302) exists in github.com/kcp-dev/kcp.
Check the vendor advisory for the affected versions of github.com/kcp-dev/kcp.
Severity: High (CVSS 8.2/10). Confidential information can be exposed externally.
Update to 0.29.3, 0.30.3.
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 'github.com/kcp-dev/kcp' . 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
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1Identify exposure identify
grep -r 'github.com/kcp-dev/kcp' . | 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
github.com/kcp-dev/kcpを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/kcp-dev/kcp to 0.29.3, 0.30.3ステージング環境で 0.29.3, 0.30.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-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
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com