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CVE-2026-6479 is a denial-of-service vulnerability in PostgreSQL connection startup handling. The flaw is caused by uncontrolled recursion during SSL and GSS negotiation while processing startup packets. A malicious client can repeatedly alternate rejected SSL and GSS encryption requests, causing the startup handler to re-enter recursively until the backend process exhausts stack space and crashes. The issue affects PostgreSQL versions before 18.4, 17.10, 16.14, 15.18, and 14.23. The vulnerable logic is associated with startup packet processing in the backend connection path, including ProcessStartupPacket() as described in supporting technical analysis.
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No public exploit code observed for this vulnerability.
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21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in PostgreSQL addressed indirectly through upgraded third-party components in Tenable Security Center.
A PostgreSQL denial-of-service vulnerability affecting SSL/GSS handling.
A PostgreSQL denial-of-service vulnerability caused by unbounded recursion while processing startup packets, allowing a malicious client to crash a backend by alternating rejected SSL and GSS encryption requests.
A PostgreSQL denial-of-service vulnerability caused by unbounded recursion while processing startup packets, allowing a malicious client to crash the backend by alternating rejected SSL and GSS encryption requests.
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.