CVE-2007-4769: The regular expression parser in TCL before 8.4.17, as used in PostgreSQL 8.2 before 8.2.6, 8.1 before 8.1....

Security readout for executives and security teams

A flaw in Tcl regular-expression handling, used by older PostgreSQL releases, can let a logged-in remote database user crash a PostgreSQL backend with a malformed back-reference. The business impact is service disruption, not confirmed data theft or code execution. The issue is historical and tied to very old PostgreSQL/Tcl versions. Exposure is most plausible in legacy PostgreSQL deployments running the named pre-fix versions, especially where authenticated users can execute regular-expression operations. Modern supported PostgreSQL versions should not be assumed affected from the provided sources. Treat this as a legacy-platform availability risk. It is unlikely to drive emergency action in modern environments, but any remaining affected PostgreSQL estate should be remediated because supported fixes existed in 2008 and the software is far beyond support life. Mitigation focus: Upgrade PostgreSQL beyond the affected fixed versions named in the CVE.; Upgrade Tcl to 8.4.17 or later where PostgreSQL depends on system Tcl regex code.; Prioritize replacement of unsupported PostgreSQL 7.4, 8.0, 8.1, and 8.2 deployments..

Prepared

Jun 28, 2026, 19:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.