An attacker can craft an input to the Parse functions that would be processed non-linearly with respect to its length, resulting in extremely slow parsing. This could cause a denial of service.
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Text nodes not in the HTML namespace are incorrectly literally rendered, causing text which should be escaped to not be. This could lead to an XSS attack.
golang.org/x/net before v0.0.0-20210520170846-37e1c6afe023 allows attackers to cause a denial of service (infinite loop) via crafted ParseFragment input.
The html package (aka x/net/html) before 2018-07-13 in Go mishandles "in frameset" insertion mode, leading to a "panic: runtime error" for html.Parse of , , or . This is related to HTMLTreeBuilder.cpp in WebKit.
The html package (aka x/net/html) through 2018-09-17 in Go mishandles , leading to a "panic: runtime error" in parseCurrentToken in parse.go during an html.Parse call.
The html package (aka x/net/html) through 2018-09-25 in Go mishandles , leading to a "panic: runtime error" (index out of range) in (*insertionModeStack).pop in node.go, called from inHeadIM, during an html.Parse call.
The html package (aka x/net/html) through 2018-09-25 in Go mishandles , leading to a "panic: runtime error" (index out of range) in (*nodeStack).pop in node.go, called from (*parser).clearActiveFormattingElements, during an html.Parse call.
The html package (aka x/net/html) through 2018-09-17 in Go mishandles <isindex/action=0>, leading to a "panic: runtime error" in inBodyIM in parse.go during an html.Parse call.