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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.

🗓️ 26 Mar 2021 07:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 2 Views

Infinite loop in SMLLexer of Pygments 1.5–2.7.3 can DoS Standard ML files with keyword exception.

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Detection

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18 Feb 2026 09:30Current
9.3High risk
Vulners AI Score9.3
CVSS 25
CVSS 3.17.5
EPSS0.00223
2