PT-2026-51015 · Sysown · Proxysql
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Published
2026-06-19
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Updated
2026-06-19
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CVE-2026-48772
CVSS v3.1
10
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. In versions 2.0.0 through 3.0.8, the ProxySQL MySQL frontend accepts the
PROXY UNKNOWN <addr> <addr> <port> <port>r PP1 frame as a well-formed PROXY protocol header. The HAProxy PROXY protocol v1 specification says that when the protocol token is UNKNOWN, the receiver MUST ignore any address fields that follow it, because the proxy has declared it cannot determine the client identity. ProxySQL parses those address fields anyway via sscanf and writes the spoofed source address into the session's addr.addr field. From there it flows directly into the query-rule matcher, where the client addr predicate decides routing and ACL. When mysql-proxy protocol networks = '*' (the default), any TCP peer can send a PP1 frame and choose any source IP claim. With that, any mysql query rules row pinned to a client addr value is forgeable: the attacker writes the address they want to match into the PP1 line, and ProxySQL routes their query as if it came from that address. In practice this is a routing and ACL bypass. Real deployments use client addr for read-write splitting (internal apps go to the primary, public traffic to read replicas), per-app schema pinning, and query-filter rules (DDL allowed only from admin CIDR, public queries blocked from dangerous patterns). An attacker that can reach the frontend port can forge their way into any of those routes. Version 3.0.9 patches this issue.Fix
Incorrect Authorization
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Related Identifiers
Affected Products
Proxysql