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Uncontrolled Resource ConsumptionWeakness · CWE-400

CVE-2026-39197

MEDIUM · 6.5 CVSS v3.1 Published 2026-06-15
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable 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
An issue in the /util/http/prelude.rs endpoint of Datadog, Inc Vector v0.54.0 allows attackers to cause a Denial of Service (DoS) via a crafted request or payload.

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 · moderate confidence

A denial of service vulnerability exists in the /util/http/prelude.rs endpoint of Vector v0.54.0, where a crafted HTTP request can cause the service to become unresponsive or crash.

MitigationUpgrade to a patched version of Vector when available, or implement rate limiting and request validation on the affected endpoint as a temporary mitigation.

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

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
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

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. Identify Vector version
    Run 'vector --version' or check the installed package version via package manager (apt, yum, brew, etc.)
    Affected if Version is exactly v0.54.0 (or falls within the 0.54.x range if additional affected versions are later identified)
  2. Verify HTTP server functionality is enabled
    Inspect Vector configuration files (vector.yaml, vector.toml, or similar) for any [http] section or 'enable-http' settings, or check if the 'http' sink or source is configured
    Affected if HTTP server or any HTTP-based source/sink is enabled in the configuration
  3. Confirm /util/http/prelude.rs endpoint exposure
    Review Vector logs for any requests to /util/http/* endpoints, or use network monitoring to observe if this internal endpoint is exposed externally
    Affected if The /util/http/prelude.rs endpoint is accessible (particularly from untrusted networks)
  4. Check service stability
    Review Vector service logs for crashes, timeouts, or 'unresponsive' entries around the time of HTTP requests
    Affected if Service exhibits crashes or hangs after receiving crafted HTTP requests

A user is affected if running Vector v0.54.0 with HTTP functionality enabled and the /util/http endpoint is exposed, especially if the service becomes unresponsive after HTTP requests.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to a patched version of Vector when available, or implement rate limiting and request validation on the affected endpoint as a temporary mitigation.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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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-2026-39197 in production — separate from our analysis above.

No notes yet

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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