No VulnCrest analysis published for this CVE yet. Below is the original CNA/NVD description, unmodified.
Description
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, decompress_mysql_payload() in lib/mysql_data_stream.cpp accepts a zlib stream when uncompress() returns Z_OK without checking that the actual output length equals the attacker-controlled payload_length. An authenticated MySQL client that negotiates compression can overstate payload_length, 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.
Exploits & detection
No public PoC or detection template found yet.
Timeline
- Published: 04 Nov 2026
- Last modified upstream: 04 Nov 2026
Sources & licenses
- CVE / CVSS / CWE
- NVD record ↗ (unmodified). This product uses the NVD API but is not endorsed or certified by the NVD. CVE® © The MITRE Corporation.
- Exploitation
- CISA KEV (CC0) · EPSS by FIRST.org
- References used for the analysis
- 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
- https://github.com/sysown/proxysql/security/advisories/GHSA-fvch-fpgq-pwfx
- Analysis, summary and remediation
- © VulnCrest