Skip to content
fr Sign in
6.0 Medium

CVE-2026-17084 The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode…

Description

The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attributes such as case-folding behavior updated since Unicode 3.2.0.

Affected products and versions

Product Affected versions Fixed in
CPython 3.15 3.15.0a1 → < 3.15.0rc2 3.15.0rc2
CPython 3.14 3.14.0 → < 3.14.8 3.14.8
CPython 3.13 3.13.0 → < 3.13.16 3.13.16
CPython 3.12 3.12.0 → < 3.12.15 3.12.15
CPython 3.11 3.11.0 → < 3.11.17 3.11.17
CPython 3.10 earliest → < 3.10.22 3.10.22

References

Timeline

  1. Published
  2. Last modified

Other CVEs of CPython

The 79 CVEs of CPython →
CVE-2026-116566 socket.getaddrinfo() previously accepted null bytes within *host* and *port* parameters which can cause the values to be… 5.3 Medium CVE-2026-103995 Lenient parsing of integers for response body and chunk framing 2.0 Low CVE-2026-115557 Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without… 9.4 Critical CVE-2026-114583 tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like… 6.9 Medium
Track this CVE