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VuXML IDDescription
bfe9adc8-0224-11f1-8790-c5fb948922adpython -- several security vulnerabilities

The Python project announces a new release with several security fixes:

  • CVE-2026-1299: gh-144125: BytesGenerator will now refuse to serialize (write) headers that are unsafely folded or delimited; see verify_generated_headers. (Contributed by Bas Bloemsaat and Petr Viktorin in gh-121650).
  • gh-143935: Fixed a bug in the folding of comments when flattening an email message using a modern email policy. Comments consisting of a very long sequence of non-foldable characters could trigger a forced line wrap that omitted the required leading space on the continuation line, causing the remainder of the comment to be interpreted as a new header field. This enabled header injection with carefully crafted inputs.
  • gh-143925: Reject control characters in data: URL media types.
  • gh-143919: Reject control characters in http.cookies.Morsel fields and values.
  • CVE-2026-0865: gh-143916: Reject C0 control characters within wsgiref.headers.Headers fields, values, and parameters.

Discovery 2026-01-16
Entry 2026-02-04
python310
>= 0

python311
< 3.11.14_2

python312
>= 0

python313
< 3.13.12

python313t
< 3.13.12

python314
< 3.14.3

CVE-2026-1299
CVE-2026-0865
https://docs.python.org/release/3.14.3/whatsnew/changelog.html