CVE-2026-3059Public exploitNetwork attack vector

Unauthenticated code execution via ZMQ pickle deserialization

Published Mar 12, 2026 · Updated Mar 12, 2026

Deserialization of untrusted data in SGLang 0.5.5 through 0.5.9 allows remote attackers to execute code through its ZMQ broker. The multimodal-generation broker binds a REP socket to every interface and passes each received payload to pickle.loads() without authentication or validation. Exploitation requires the multimodal-generation server and network access to its broker port; code runs with the SGLang process's privileges.

CVSS severity9.8
Critical
EPSS probability1.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in SGLang 0.5.5 through 0.5.9 allows remote attackers to execute code through its ZMQ broker. The multimodal-generation broker binds a REP socket to every interface and passes each received payload to pickle.loads() without authentication or validation. Exploitation requires the multimodal-generation server and network access to its broker port; code runs with the SGLang process's privileges.

The record

CVE
CVE-2026-3059
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
SGLang
Product
SGLang
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.5.5 <=0.5.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SGLang · SGLangversion=0.5.5 <=0.5.9

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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