Vulnerability in Arc (CVE-2026-48106)
Summary
Vulnerability in Arc (CVE-2026-48106). Risk of unauthorized operations or information disclosure. Exploitable via MsgReplicateSync. Mitigation: upgrade to 2026.06.1 or later.
Original description
The description as published by the source.
Arc is an open, SQL-native time-series database for telemetry. Prior to version 26.06.1, Arc Enterprise's cluster replication receiver at internal/cluster/replication/receiver.go validates only the wire-format envelope (length, opcode) of inbound messages. The MsgReplicateSync payload itself is accepted without any application-layer authentication — no HMAC, no signature, no per-message nonce. The replication stream is protected at the transport layer by TLS / mTLS, but there is no protection against application-layer message tampering or replay once a peer is on the cluster network. This is fixed in 2026.06.1. Some workarounds are available. Restrict cluster network access to known-trusted peers via strict firewall rules, audit replication logs for unexpected MsgReplicateSync traffic, and/or disable cluster mode until the fix is available.
Source: NIST National Vulnerability Database NVD
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-2026-48106 has been found in Arc.
Attackers can target a specific entry point like MsgReplicateSync over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Arc to 2026.06.1 or later.
If unsure, ask your IT team or search "Arc CVE-2026-48106" on the vendor's site.
CVE-2026-48106 (Arc) — CWE-306
Attack surface: MsgReplicateSync
Patched: 2026.06.1 — 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-306) exists in Arc. Attackers reach the vulnerable code path via MsgReplicateSync.
Check the vendor advisory for the affected versions of Arc. Attack surface: MsgReplicateSync.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 2026.06.1.
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 'Arc' . 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 'Arc' . | 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
Arc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 Arc to 2026.06.1ステージング環境で 2026.06.1 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。