| Name | CVE-2026-17084 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1147445 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| pypy3 (PTS) | bookworm | 7.3.11+dfsg-2+deb12u3 | vulnerable |
| trixie | 7.3.19+dfsg-2 | vulnerable | |
| forky, sid | 8.0.0+dfsg-1 | vulnerable | |
| python3.11 (PTS) | bookworm | 3.11.2-6+deb12u8 | vulnerable |
| bookworm (security) | 3.11.2-6+deb12u3 | vulnerable | |
| python3.13 (PTS) | trixie | 3.13.5-2+deb13u5 | vulnerable |
| forky, sid | 3.13.15-1 | vulnerable | |
| python3.14 (PTS) | forky | 3.14.7-4 | fixed |
| sid | 3.14.7-5 | fixed | |
| python3.15 (PTS) | forky | 3.15.0~rc2-2 | fixed |
| sid | 3.15.0~rc2-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| pypy3 | source | (unstable) | (unfixed) | 1147445 | ||
| python2.7 | source | bullseye | (unfixed) | end-of-life | ||
| python2.7 | source | (unstable) | (unfixed) | |||
| python3.11 | source | (unstable) | (unfixed) | |||
| python3.13 | source | (unstable) | (unfixed) | |||
| python3.14 | source | (unstable) | 3.14.7-3 | |||
| python3.15 | source | (unstable) | 3.15.0~rc2-1 | |||
| python3.9 | source | (unstable) | (unfixed) |
[trixie] - python3.13 <no-dsa> (Minor issue)
[bullseye] - python2.7 <end-of-life> (EOL in bullseye LTS)
[trixie] - pypy3 <no-dsa> (Minor issue)
[bookworm] - pypy3 <postponed> (Minor issue)
https://mail.python.org/archives/list/security-announce@python.org/thread/EUHHTC6EV7HCLSUHP25C5VHSV4V2MUZN/
https://github.com/python/cpython/issues/155292
https://github.com/python/cpython/pull/155293
Fixed by: https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc (main)
Fixed by: https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7 (v3.15.0rc2)
Fixed by: https://github.com/python/cpython/commit/1e54caa096678a38afcabecabb1ff72400dd6bae (3.14)