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[3.12] gh-150751: validate http.client Content-Length and chunk-size (GH-150752) - #160772
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miss-islington wants to merge 2 commits into
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…ythonGH-150752) RFC 9112 defines Content-Length as 1*DIGIT and chunk-size as 1*HEXDIG, but int() also accepts a sign, underscores, surrounding whitespace and an 0x prefix, so malformed framing values were parsed instead of rejected. (cherry picked from commit 2eb2af8) Co-authored-by: metsw24-max <metsw24@gmail.com>
This was referenced Oct 27, 2026
…http.client (pythonGH-159156) pythongh-150752 started validating the Content-Length value against the RFC 9112 grammar (1*DIGIT), but the compat32 header parser keeps trailing SP/HTAB in the field value, so "Content-Length: 5 " is now treated as a missing header. HTTPResponse then assumes that the connection will close and read() blocks until the server closes it, which never happens on a keep-alive connection. RFC 9112, section 5.1 says that optional whitespace around a field value is excluded by parsers. Strip SP/HTAB before the grammar check; values such as "+5", "5_0" and "5 0" are still rejected.
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RFC 9112 defines Content-Length as 1DIGIT and chunk-size as 1HEXDIG, but int() also accepts a sign, underscores, surrounding whitespace and an 0x prefix, so malformed framing values were parsed instead of rejected.
(cherry picked from commit 2eb2af8)
Co-authored-by: metsw24-max metsw24@gmail.com