Bug 2490900 (CVE-2026-48773)

Summary: CVE-2026-48773 proxysql: ProxySQL: Arbitrary code execution via pre-authentication heap memory corruption
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: urgent    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in ProxySQL. A remote, unauthenticated attacker could exploit a heap memory corruption vulnerability by sending an oversized initial packet during the MySQL or PostgreSQL protocol handshake. This could allow the attacker to execute arbitrary code or cause a denial of service (DoS) on the system.
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Bug Depends On: 2491734    
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Description OSIDB Bzimport 2026-06-19 20:01:27 UTC 
ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Versions 2.0.18 through 3.0.8 have a pre-authentication heap memory corruption vulnerability in the MySQL and PostgreSQL protocol first-read paths. A remote unauthenticated client can declare an oversized first packet length, and ProxySQL passes that attacker-controlled length directly to `recv()` while writing into a fixed 32 KB input queue. Version 3.0.9 patches the issue.