Bug 2527314

Summary: CVE-2026-16241 postgresql18: PostgreSQL ECPG: Denial of Service via integer underflow [fedora-all]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: postgresql18Assignee: Filip Januš <fjanus>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: rawhideCC: db-sig, fjanus, ndavidov
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["a5bae694-05e8-4167-acf9-8202f867d7a2"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2515320    

Description Srikanth Balasubramanian 2026-09-02 10:31:03 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix.  The client overwrites a huge memory region with bytes outside attacker knowledge or control.  This typically yields a simple SIGSEGV, but rare cases might achieve client-specific integrity impact via the write.  Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.