CVE-2026-48773Public exploitNetwork attack vectorHinoki check available

Pre-auth heap overflow via oversized first packet

Published Jun 19, 2026 · Updated Jun 19, 2026

Heap memory corruption in ProxySQL 2.0.18 through 3.0.8 allows remote attackers to overwrite heap memory via an oversized first packet. The MySQL and PostgreSQL read_from_net paths pass the packet-declared length to recv() while writing after a header in a fixed 32 KB input queue. Any reachable affected protocol listener exposes the flaw before authentication; demonstrated consequences are heap corruption and a process crash, not code execution.

CVSS severity9.8
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap memory corruption in ProxySQL 2.0.18 through 3.0.8 allows remote attackers to overwrite heap memory via an oversized first packet. The MySQL and PostgreSQL read_from_net paths pass the packet-declared length to recv() while writing after a header in a fixed 32 KB input queue. Any reachable affected protocol listener exposes the flaw before authentication; demonstrated consequences are heap corruption and a process crash, not code execution.

The record

CVE
CVE-2026-48773
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
SysOwn
Product
ProxySQL
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 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=>= 2.0.18, < 3.0.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SysOwn · ProxySQLversion=>= 2.0.18, < 3.0.9

Published CVSS scores

9.8GitHub, Inc.CVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write
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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