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CVE-2026-61546high8.8

AnkiMCP: DNS rebinding reaches unauthenticated local AnkiMCP HTTP tools

Impact

AnkiMCP versions prior to 0.21.0 have a weakness that allows an attacker to access local AnkiMCP HTTP tools via DNS rebinding, potentially reading or modifying the local collection. The attacker needs to trick a victim into visiting a malicious web page. Impact depends on enabled tool filters.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

ankimcp · GitHub_M

anki-mcp-server-addon

1 range
GitHub_M version evidence

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affected

< 0.21.0

unaffected

unknown

Other versions: unknown

Original source description

AnkiMCP is an Anki addon that implements an MCP server, enabling AI assistants to interact with the Anki flashcard application. Prior to version 0.21.0, anki_mcp_server/mcp_server.py globally disables FastMCP DNS-rebinding protection through TransportSecuritySettings with enable_dns_rebinding_protection=False, including for the default local Streamable HTTP listener. The defaults in anki_mcp_server/config.py enable http_enabled on 127.0.0.1:3141, with an empty http_path selecting the root endpoint. No bearer token, API key, session secret, strict Host allowlist or strict Origin allowlist is enforced before initialize, tools/list and tools/call reach MCP dispatch. A victim who visits a malicious web page while Anki and the listener are running can have browser requests rebound to loopback, allowing the attacker to initialize MCP, enumerate tools, read the local collection, and perform enabled non-destructive note/deck creation or updates. The attacker needs neither LAN position nor a local process. Available operations depend on enabled tool filters; destructive tools are hidden unless enabled_destructive_tools is opted into, limiting deletion-level impact but not the exposed read/write operations. The reported harness confirms real MCP tool dispatch with substituted Anki bridge responses rather than demonstrating destructive changes to a real collection. Disabling protection for tunnels/proxies also disables it for the normal loopback configuration. This issue is fixed in version 0.21.0.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-61546

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cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-346 ↗

CWE-346: Origin Validation Error

GitHub_M

Related →
CWE-350 ↗

CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action

GitHub_M

Related →
Contributing organizations · 2
GitHub_M

Assigning organization

2026-10-28
CISA-ADP

Additional data publisher

2026-10-29

What changed

Follow changes
  1. CVE · CVE-2026-61546

    Observed 2026-10-29T18:49:22.195Z · upstream updated 2026-10-29T18:24:59.680Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-29T18:24:19.481141Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "poc"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

4 sources
github.com/ankimcp/anki-mcp-server-addon/security/advisories/GHSA-j9xx-59ph-wmr6
exploitGitHub_M · CISA-ADP
github.com/ankimcp/anki-mcp-server-addon/commit/6dcb6939b0ecc0801f45cf0d241dc946aad1654f
PatchGitHub_M
github.com/ankimcp/anki-mcp-server-addon/commit/d5306ff42d68f1e3b82a96878eb059437e820316
PatchGitHub_M
github.com/ankimcp/anki-mcp-server-addon/tree/v0.21.0
Source referenceGitHub_M