Matching repeated extended grapheme cluster may crash: $ pcretest PCRE version 8.33 2013-05-28 re> /\X?abc/8Y data> \xff\x7f\x00\x00\x03\x00\x41\xcc\x80\x41\x{300}\x61\x62\x63\x00\>06\? Segmentation fault This has been reported to upstream <http://bugs.exim.org/show_bug.cgi?id=1370> and fixed by upstream after 8.33 version with commit: r1350 | ph10 | 2013-07-26 12:03:38 +0200 (Pá, 26 čec 2013) | 2 lines Fix backup bugs with \X repeat matches. Upstream pcre 8.32 and 8.33 are affected. Affected Fedoras: F≥19 (pcre-8.32-7.fc19.x86_64).
This is not easy to back-port because the affected code has been rewritten to use tail recursion. There is also plenty of other commits in between.
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Resolved in Fedora 21.