An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.Referenceshttps://bugzilla.redhat.com/show_bug.cgi?id=1922136https://www.debian.org/security/2021/dsa-4889https://lists.debian.org/debian-lts-announce/2021/05/msg00003.htmlhttps://lists.debian.org/debian-lts-announce/2021/05/msg00006.htmlhttps://www.oracle.com/security-alerts/cpuoct2021.html
