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Back to active CVEs
High · CVSS 8.3CVE-2026-48106

Arc Enterprise cluster replication accepts unauthenticated MsgReplicateSync messages, enabling cluster-wide data injection from any TLS-trusted peerCVE-2026-48106

Answer in brief

CVE-2026-48106 records a High severity (CVSS 8.3) vulnerability in Arc Enterprise cluster replication accepts unauthenticated MsgReplicateSync messages, enabling cluster-wide data injection from any TLS-trusted peer. The current sources do not mark it as known exploited. The current feed maps Basekick-Labs/arc (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Sep 9, 2026Source checked Oct 6, 2026First seen by HOL Aug 21, 2026Material review Sep 9, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Basekick-Labs/arc (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Basekick-Labs/arcgeneric<2026.06.12026.06.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Basekick-Labs/arc.
  2. 2Review the reported fix. Update Basekick-Labs/arc to 2026.06.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 21, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP serverAlso CWE-345
  • Mooncake through 0.3.13.post1 Missing Authentication in Store REST ServiceAlso CWE-306
  • Mooncake Store through 0.3.13.post1 Unauthenticated Object Deletion via Remove RPCsAlso CWE-306
  • Cross-Site Scripting (XSS) vulnerability identified in OpenText™ Content ManagementSame generic ecosystem
  • Denial-of-service vulnerability in ESET PROTECT On-PremSame generic ecosystem
  • HortusFox < 6.2 Remote Code Execution via Theme ImportSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-306, CWE-345, CWE-924
Source
CVE List V5
Source checked
Oct 6, 2026
References
1 linked source
Open source record