Debian Security Advisory 1556-2 - An editorial mistake resulted in DSA-1556-1 not correctly applying the required change, making it ineffective. This DSA has been reissued as DSA-1556-2. It has been discovered that the Perl interpreter may encounter a buffer overflow condition when compiling certain regular expressions containing Unicode characters. This also happens if the offending characters are contained in a variable reference protected by the \Q...\E quoting construct. When encountering this condition, the Perl interpreter typically crashes, but arbitrary code execution cannot be ruled out.
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