Pre-auth heap overflow in ProxySQL first-packet handling
CVE-2026-48773 is a critical pre-authentication heap memory corruption vulnerability in ProxySQL affecting versions 2.0.18 through 3.0.8. The flaw is in the MySQL and PostgreSQL protocol first-read/first-packet handling paths. A remote unauthenticated client can declare an oversized initial packet length, and ProxySQL uses that attacker-controlled length directly in recv() while receiving data into a fixed 32 KB input queue. This can cause a heap-based buffer overflow before authentication is completed.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.