gh-137146: Restrict IPvFuture address parsing to RFC 3986-valid characters #137147
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IPvFuture hostnames in URLs were being matched using a too-permissive regex
(`.+`), which allowed invalid characters not defined by RFC 3986.
This patch updates the pattern to only accept characters explicitly allowed
by the RFC for IPvFuture addresses.
According to RFC 3986 §3.2.2, the format of IPvFuture is:
"v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
Where:
- unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
- sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
Before the fix:
>>> import urllib.parse
>>> urllib.parse.urlparse("http://[v45.test|test]/path")
ParseResult(scheme='http', netloc='[v45.test|test]', path='/path', ...)
Invalid characters such as `|` were incorrectly accepted.
After the fix:
>>> import urllib.parse
>>> urllib.parse.urlparse("http://[v45.test|test]/path")
Traceback (most recent call last):
...
ValueError: IPvFuture address is invalid
This improves standards compliance and prevents malformed URLs from being
silently accepted.
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This PR fixes overly permissive validation of IPvFuture hostnames in
urllib.parse(#137146).Previously, the regex used to match IPvFuture (
v...) components allowed all characters (.+), which is incorrect. According to RFC 3986 §3.2.2, an IPvFuture should match the following structure:Where:
unreserved= ALPHA / DIGIT / "-" / "." / "_" / "~"sub-delims= "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="This patch replaces the permissive regex with one that strictly enforces this allowed character set.
Before the fix:
After the fix:
This improves standards compliance and helps prevent silent acceptance of malformed or unsafe host components.
urllib.parseaccepts invalid characters in IPv6 ZoneIDs and IPvFuture addresses #137146