CVE-2026-81095Network attack vectorHinoki check available

Browser-mediated MCP access via unchecked Host header

Published Aug 27, 2026 · Updated Aug 27, 2026

DNS rebinding in Timescale, Inc. pg-aiguide 0.5.0 and earlier allows remote attackers to access its local MCP server through a browser. In src/httpServer.ts, httpServerFactory starts the HTTP transport without dnsRebindingProtection, so requests naming attacker-controlled hosts pass unchecked. Exploitation requires a visitor’s browser to reach the bound address; successful access permits reading and modifying data exposed by MCP tools.

CVSS severity7.6
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

DNS rebinding in Timescale, Inc. pg-aiguide 0.5.0 and earlier allows remote attackers to access its local MCP server through a browser. In src/httpServer.ts, httpServerFactory starts the HTTP transport without dnsRebindingProtection, so requests naming attacker-controlled hosts pass unchecked. Exploitation requires a visitor’s browser to reach the bound address; successful access permits reading and modifying data exposed by MCP tools.

The record

CVE
CVE-2026-81095
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Timescale, Inc.
Product
pg-aiguide
Classifications
CWE-346, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Timescale, Inc. · pg-aiguideversion=0 <=0.5.0

Published CVSS scores

7.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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