ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL.
CVE-2026-102664
ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Prior to 3.0.10, 3.1.10, and 4.0.10, decompressmysqlpayload() in lib/mysqldatastream.cpp accepts a zlib stream when uncompress() returns ZOK without checking that the actual output length equals the attacker-controlled payloadlength. An authenticated MySQL client that negotiates compression can overstate payloadlength, causing buffer2array() to parse the uninitialized tail of a heap buffer as MySQL packet headers and forward stale data to the backend. Backend error responses can disclose prior SQL queries, result data, credentials, or session state, and malformed lengths can also cause excessive allocations. This issue is fixed in versions 3.0.10, 3.1.10, and 4.0.10.
Assessment
- CVSS
- 7.1 (v3.1)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 4 November 2026
- Last updated
- 4 November 2026
- Assigner
- GitHub_M
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
At the source
References
- https://github.com/sysown/proxysql/security/advisories/GHSA-fvch-fpgq-pwfx
- https://github.com/sysown/proxysql/commit/396c742f7d50b1f479e1157e296ee9d0aff1b724
- https://github.com/sysown/proxysql/commit/a8c1cef4d44c4beea7f6aa21b8a09a7cb8c75520
- https://github.com/sysown/proxysql/releases/tag/v3.0.10
- https://github.com/sysown/proxysql/releases/tag/v3.1.10
- https://github.com/sysown/proxysql/releases/tag/v4.0.10
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