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The gnu regular expression code in file 4.20 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted document with a large number of line feed characters, which is not well handled by OS/2 REXX regular expressions that use wildcards, as originally reported for AMaViS.
Use Amavis vendor hub and Virus Scanner product page to widen CVE-2007-2026 into its surrounding weakness, vendor, and product context.
Compare it with CVE-1999-1512 and CVE-2002-1109 for nearby disclosures in the same product family.