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  4. CVE 2026 120399 flightctl api flightctl remote access flightctl
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Back to active CVEs
High · CVSS 7.5CVE-2026-120399

Flightctl-api: flightctl-remote-access: flightctl: unbounded tls handshake in conncontext can block accepting connectionsCVE-2026-120399

Answer in brief

CVE-2026-120399 records a High severity (CVSS 7.5) vulnerability in Flightctl-api: flightctl-remote-access: flightctl: unbounded tls handshake in conncontext can block accepting connections. The current sources do not mark it as known exploited. The current feed maps Red Hat/rhem/flightctl-api-rhel10 (generic), Red Hat/rhem/flightctl-api-rhel9 (generic), Red Hat/rhem/flightctl-remote-access-rhel10 (generic), Red Hat/rhem/flightctl-remote-access-rhel9 (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 Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. 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 Red Hat/rhem/flightctl-api-rhel10 (generic), Red Hat/rhem/flightctl-api-rhel9 (generic), Red Hat/rhem/flightctl-remote-access-rhel10 (generic), Red Hat/rhem/flightctl-remote-access-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/rhem/flightctl-api-rhel10generic*Not reported
Red Hat/rhem/flightctl-api-rhel9generic*Not reported
Red Hat/rhem/flightctl-remote-access-rhel10generic*Not reported
Red Hat/rhem/flightctl-remote-access-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/rhem/flightctl-api-rhel10, Red Hat/rhem/flightctl-api-rhel9, Red Hat/rhem/flightctl-remote-access-rhel10.
  2. 2Review the reported fix. Source-reported workaround: The services can be recovered by restarting the server and blocking the malicious device at network level. As a temporary workaround, you can schedule a recurrent check on the listener's Recv-Q; when the queue is non-zero, this terminates idle connections that have received almost no data.

Evidence timeline and material changes

  1. Published upstream

    Nov 10, 2026

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

  2. Source modified

    Nov 10, 2026

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

  3. First seen by HOL

    Nov 10, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in flightctl. A TLS handshake is performed synchronously in the HTTP server’s connection-context callback without a deadline. A network-reachable unauthenticated client can stall the handshake and prevent the affected listener from accepting new connections.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-1322
Source
CVE List V5
Source checked
Nov 10, 2026
References
2 linked sources
Open source record