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Vulnerabilities

Vulnerability · CVE-2025-66455

LMDeploy is a toolkit for compressing, deploying, and serving large language models.

Published Sep 18, 2026 · catalog updated Oct 14, 2026 · LMDeploy is a toolkit

Check if you run it

No confirmed exploitation is on record for CVE-2025-66455. EPSS is 0.69%. Act only if a listed version of LMDeploy is a toolkit is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (LMDeploy is a toolkit).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.69%
Remediation
Advisory link
Affected products
See sources for product scope

LMDeploy is a toolkit for compressing, deploying, and serving large language models. Starting in version 0.9.2 and prior to version 0.16.0, LMDeploy's PyTorch DistServe/PD-disaggregation control plane used to deserialize messages received through a ZeroMQ PULL socket. PyZMQ implements using Python pickle deserialization, which can execute arbitrary code while reconstructing an object. The peer address used by the receiver was supplied through the HTTP endpoint. An attacker who could reach an affected DistServe API server could cause the server to connect to an attacker-controlled ZeroMQ endpoint and deserialize a crafted pickle payload. API-key authentication is not enabled unless the operator explicitly configures it. As a result, affected DistServe deployments without API keys allowed unauthenticated remote code execution with the privileges of the LMDeploy serving process. This issue affects the PyTorch backend when PD-disaggregation/DistServe is enabled. Ordinary deployments that do not use the affected disaggregated-serving path do not expose this data flow. The fix was released in LMDeploy 0.16.0. Users who cannot upgrade immediately should prevent untrusted clients from reaching endpoints, restrict the DistServe HTTP and ZeroMQ control planes to trusted cluster networks, configure API-key authentication, and block arbitrary outbound ZeroMQ connections from serving nodes. These measures reduce exposure but do not make pickle deserialization safe.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2025-66455

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-66455. EPSS is 0.69%. Act only if a listed version of LMDeploy is a toolkit is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 0.69%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 18, 2026 · NIST NVD

    Detected

    LMDeploy is a toolkit for compressing, deploying, and serving large language models. Starting in version 0.9.2 and prior to version 0.16.0, LMDeploy's PyTorch DistServe/PD-disaggregation control plane used to deserialize messages received through a ZeroMQ PULL socket. PyZMQ implements using Python pickle deserialization, which can execute arbitrary code while reconstructing an object. The peer add

  2. Oct 14, 2026 · NIST NVD

    Updated

    LMDeploy is a toolkit for compressing, deploying, and serving large language models. Starting in version 0.9.2 and prior to version 0.16.0, LMDeploy's PyTorch DistServe/PD-disaggregation control plane used to deserialize messages received through a ZeroMQ PULL socket. PyZMQ implements using Python pickle deserialization, which can execute arbitrary code while reconstructing an object. The peer add

Sources

  • CVE.orgVulnerability recordCVE-2025-66455

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66455

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2025-66455

    LMDeploy is a toolkit for compressing, deploying, and serving large language models. Starting in version 0.9.2 and prior to version 0.16.0, LMDeploy's PyTorch DistServe/PD-disaggregation control plane used to deserialize messages received through a ZeroMQ PULL sock

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.