CVE-2026-118623VulnerabilityPublished 29 Oct 2026

ZDI-26-839: MLflow PickleEvaluationArtifact Deserialization of Untrusted Data Remote Code Execution Vulnerability

Source Zero Day Initiative

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Not known to be exploited.

Data as of 29 Oct 2026, 19:18 UTC

Severity

High

Rated High by Zero Day Initiative · CVSS not yet scored by NVD

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Until a fix is available, avoid opening untrusted files or visiting untrusted web pages that could trigger the vulnerability. Monitor official MLflow and Zero Day Initiative advisories for updates and patches.

Description

A remote code execution vulnerability exists in MLflow's PickleEvaluationArtifact deserialization process. Exploitation requires user interaction, such as visiting a malicious page or opening a malicious file. The vulnerability has a high severity rating of 7.8 assigned by ZDI and is tracked as CVE-2026-118623.

Impact

Successful exploitation enables remote code execution on the affected system, potentially allowing attackers to run arbitrary code with the privileges of the MLflow process. This can lead to full system compromise depending on the environment and privileges of the MLflow service. User interaction is required for exploitation, which limits the attack vector to scenarios involving social engineering or malicious content delivery.

References

zerodayinitiative.com/advisories/ZDI-26-839/ (opens in a new tab)

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