CVE-2026-64849

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreHIGH confidence

Score elevated to 9.3 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-08-19), indicating real-world exploitation has been confirmed by US federal agencies. a secondary CVSS source baseline 9.3 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, secondary
Trending — KEV-added this weekExploited in the wild
9.3EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 8%CVSS: 9.3Exploit: cisa kev · ssvc active · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Prior to 3.15.0, the unauthenticated POST /api/2.0/mlflow/webhooks/{id}/test endpoint calls _validate_webhook_url() in mlflow/utils/validation.py only for the original URL while mlflow/webhooks/delivery.py follows redirects and re-resolves the hostname without pinning the validated address, allowing attackers to reach internal or cloud metadata services and receive response_status and response_body. This issue is fixed in version 3.15.0.

CVSS v3
9.3
EG Score
9.3(high)
EG Risk
97(Attend)
EG Risk 97/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
8%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

August 17, 2026

Last Modified

August 20, 2026

Advisory Details (5)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

v3.15.0

Patch available: mlflow/mlflow v3.15.0

https://github.com/mlflow/mlflow/releases/tag/v3.15.0
github_commit

commit ba949522477c (mlflow/mlflow)

Fix landed in mlflow/mlflow commit ba949522477c — awaiting tagged release

https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939
github_pr

Fix DNS-rebinding SSRF bypass in webhook delivery

Fix merged in mlflow/mlflow PR #24258 on 2026-07-02 — awaiting tagged release

https://github.com/mlflow/mlflow/pull/24258
generic

DNS rebinding bypass of webhook SSRF protection enables cloud metadata access · Issue #24179 · mlflow/mlflow · GitHub

https://github.com/mlflow/mlflow/issues/24179
github Patch Available🟡 PoC Available

Unauthenticated full-read SSRF in MLflow webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding) · Advisory · mlflow/mlflow · GitHub

https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j

Vendor Advisories for CVE-2026-64849(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
mlflow0.0.1 ... 3.9.0rc0 (182 versions)3.15.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 23:37 UTCEG score recompute
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-20 19:18 UTCEG score recompute
  4. 2026-08-20 18:52 UTCEG score recompute
  5. 2026-08-20 17:06 UTCCISA KEV update
  6. 2026-08-20 04:20 UTCEG score recompute
  7. 2026-08-20 04:08 UTCEG score recompute
  8. 2026-08-19 18:54 UTCEG score recompute
  9. 2026-08-19 18:18 UTCEG score recompute
  10. 2026-08-19 17:53 UTCEG score recompute
  11. 2026-08-19 17:35 UTCEG score recompute
  12. 2026-08-19 17:33 UTCCISA KEV update
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 04:20 UTCEG score recompute
  15. 2026-08-19 04:12 UTCEG score recompute
  16. 2026-08-18 18:25 UTCEG score recompute
  17. 2026-08-18 18:00 UTCEG score recompute
  18. 2026-08-18 15:43 UTCEG score recompute
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 22:22 UTCEG score recompute
  21. 2026-08-17 21:30 UTCEG score recompute
  22. 2026-08-17 21:29 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-64849.yaml
    First seen Jan 1, 2026

    MLflow Webhook SSRF - Unauthenticated Full-Read via Redirect Bypass

    Open source ↗

Frequently asked(6)

What is CVE-2026-64849?
CVE-2026-64849 is a critical vulnerability published on August 17, 2026. MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Prior to 3.15.0, the unauthenticated POST /api/2.0/mlflow/webhooks/{id}/test endpoint calls validatewebhookurl() in mlflow/utils/validation.py only for the original URL while…
When was CVE-2026-64849 disclosed?
CVE-2026-64849 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64849 actively exploited?
Yes. CISA added CVE-2026-64849 to the Known Exploited Vulnerabilities catalog on August 19, 2026, affecting MLflow MLflow. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-64849?
CVE-2026-64849 has a CVSS v3 base score of 9.3 (NVD).
Which products are affected by CVE-2026-64849?
CVE-2026-64849 affects MLflow MLflow. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-64849?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64849, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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