Vulnerability in @libp2p/kad-dht (CVE-2026-45783)
Summary
Vulnerability in @libp2p/kad-dht (CVE-2026-45783). Risk of unauthorized operations or information disclosure. Exploitable via PUT_VALUE. Mitigation: upgrade to 16.2.6 or later.
Original description
The description as published by the source.
libp2p is a JavaScript Implementation of libp2p networking stack. Prior to version 16.2.6, an unauthenticated remote peer can exhaust the disk storage of any @libp2p/kad-dht node running in server mode by sending an unbounded stream of PUT_VALUE messages whose keys bypass all content validation. No credentials, no prior relationship, and no protocol deviation beyond a crafted key are required. The victim node's datastore fills until the host disk is exhausted, making the node unavailable. This issue has been patched in version 16.2.6.
Source: GitHub Security Advisories (Global) 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-2026-45783 has been found in @libp2p/kad-dht.
Attackers can target a specific entry point like PUT_VALUE over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade @libp2p/kad-dht to 16.2.6 or later.
If unsure, ask your IT team or search "@libp2p/kad-dht CVE-2026-45783" on the vendor's site.
CVE-2026-45783 (@libp2p/kad-dht) — CWE-20 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: PUT_VALUE / verifyRecord / BYPASS / RATE
Patched: 16.2.6 — 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-20) exists in @libp2p/kad-dht. Attackers reach the vulnerable code path via PUT_VALUE without authentication.
Check the vendor advisory for the affected versions of @libp2p/kad-dht. Attack surface: PUT_VALUE / verifyRecord / BYPASS / RATE.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 16.2.6.
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 '@libp2p/kad-dht' . 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 '@libp2p/kad-dht' . | 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
@libp2p/kad-dht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 @libp2p/kad-dht to 16.2.6ステージング環境で 16.2.6 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。
-
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
- advisory github.com
- package github.com
- web github.com