dbcve.org
FastnetmonApplication · Pavel Odintsov

CVE-2026-48697

HIGH · 7.4 CVSS v3.1 Published 2026-05-26
Fix available
A fix is available. Upgrade to after 1.2.9 or later.
See remediation →
83/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
FastNetMon Community Edition through 1.2.9 does not verify TLS certificates on outbound HTTPS connections. The execute_web_request_secure() function in src/fast_library.cpp creates a boost::asio::ssl::context with tls_client mode and calls set_default_verify_paths() to load CA certificates, but never calls set_verify_mode(boost::asio::ssl::verify_peer). Without this call, OpenSSL performs the TLS handshake without validating the server's certificate chain, making all HTTPS connections vulnerable to man-in-the-middle attacks. This function is used for telemetry reporting to community-stats.fastnetmon.com, which sends system information including CPU model, kernel version, traffic statistics, and software configuration. An attacker can intercept and modify this data or redirect it to a malicious server.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

FastNetMon Community Edition through 1.2.9 fails to verify TLS server certificates in outbound HTTPS connections. The execute_web_request_secure() function in src/fast_library.cpp loads CA certificates but never enables peer verification by calling set_verify_mode(boost::asio::ssl::verify_peer), allowing MITM attacks on telemetry data sent to community-stats.fastnetmon.com.

MitigationAdd set_verify_mode(boost::asio::ssl::verify_peer) call after set_default_verify_paths() in the SSL context initialization to enable certificate chain validation.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FastnetmonApplication
Affected:<= 1.2.9

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check installed FastNetMon version
    Run 'fastnetmon --version' or check the package version installed via your package manager (dpkg -l fastnetmon, rpm -qi fastnetmon, or similar)
    Affected if Version is 1.2.9 or lower
  2. Locate vulnerable source file
    Find src/fast_library.cpp in the FastNetMon source code installation and verify it contains the execute_web_request_secure() function
    Affected if The file and function exist in the installation
  3. Inspect SSL configuration in execute_web_request_secure()
    Examine the execute_web_request_secure() function in src/fast_library.cpp and search for 'set_verify_mode' calls. Specifically look for whether set_verify_mode(boost::asio::ssl::verify_peer) is present
    Affected if The function calls set_default_verify_paths() but does NOT call set_verify_mode(boost::asio::ssl::verify_peer)
  4. Check if outbound telemetry is enabled
    Examine FastNetMon configuration files (typically in /etc/fastnetmon/ or similar) for settings related to community stats reporting, telemetry, or connections to community-stats.fastnetmon.com
    Affected if Telemetry or community stats reporting to community-stats.fastnetmon.com is enabled

You are affected if FastNetMon version is 1.2.9 or lower, the execute_web_request_secure() function lacks set_verify_mode(boost::asio::ssl::verify_peer) in src/fast_library.cpp, and outbound HTTPS connections to community-stats.fastnetmon.com are enabled.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 1.2.9
Interim mitigation

Add set_verify_mode(boost::asio::ssl::verify_peer) call after set_default_verify_paths() in the SSL context initialization to enable certificate chain validation.

Recommended fix Moderate confidence

FastNetMon Community Edition 1.2.10 or later (check GitHub releases for first version containing the fix)

  1. Check the FastNetMon GitHub repository (github.com/fastnetmon) for releases newer than 1.2.9 that address this certificate validation vulnerability
  2. If a fixed version (1.2.10 or later) is available, upgrade to that version using the standard installation method for your platform
  3. After upgrade, verify the fix by reviewing src/fast_library.cpp to confirm set_verify_mode(boost::asio::ssl::verify_peer) is now called after set_default_verify_paths() in the execute_web_request_secure() function
  4. Test telemetry functionality to ensure HTTPS connections work correctly with proper certificate validation

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Fastnetmon Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA2.0 h
9.0 hours of engineering $1,570
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,512.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2026-48697 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-48697 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data