{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-48773: ProxySQL pre-auth heap overflow in MySQL and PostgreSQL first-packet handling","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-48773","status":"final","version":"1","initial_release_date":"2026-06-19T19:27:12.183Z","current_release_date":"2026-06-19T19:27:12.183Z","revision_history":[{"date":"2026-06-19T19:27:12.183Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-48773 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-48773"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-48773"},{"category":"external","summary":"https://github.com/sysown/proxysql/security/advisories/GHSA-58ww-865x-grpr","url":"https://github.com/sysown/proxysql/security/advisories/GHSA-58ww-865x-grpr"},{"category":"external","summary":"https://github.com/sysown/proxysql/releases/tag/v3.0.9","url":"https://github.com/sysown/proxysql/releases/tag/v3.0.9"}]},"product_tree":{"branches":[{"category":"vendor","name":"sysown","branches":[{"category":"product_name","name":"proxysql","branches":[{"category":"product_version","name":">= 2.0.18, < 3.0.9","product":{"name":"sysown proxysql >= 2.0.18, < 3.0.9","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:sysown:proxysql:\\>\\=_2.0.18\\,_\\<_3.0.9:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-48773","title":"ProxySQL pre-auth heap overflow in MySQL and PostgreSQL first-packet handling","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}