PatchTheCVECVE-2026-17084: The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unico
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Routine
MEDIUM 6.0
CVE-2026-17084 is a medium-severity flaw (CVSS 6.0) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.0 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Passive |
| EPSS exploit chance | 0.7% (top 46%) |
| CISA exploited list | No |
| Weakness | CWE-436 |
| Published | 2026-08-18 |
| Last modified | 2026-10-22 |
Publisher (CNA): Python Software Foundation
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source
sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39
Debian 12 · pypy3 · NO FIX YET
Debian 13 · pypy3 · NO FIX YET
Debian 12 · python3.11 · FIXED · 3.11.2-6+deb12u9
sudo apt update && sudo apt install --only-upgrade python3.11
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' python3.11)" ge "3.11.2-6+deb12u9" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · python3.13 · NO FIX YET
Alpine 3.21 · python3 · FIXED · python3-3.12.15-r0
apk add --upgrade python3
apk info -v python3
Alpine 3.22 · python3 · FIXED · python3-3.12.15-r0
apk add --upgrade python3
apk info -v python3
Alpine 3.23 · python3 · FIXED · python3-3.12.15-r0
apk add --upgrade python3
apk info -v python3
Alpine 3.24 · python3 · FIXED · python3-3.14.8-r0
apk add --upgrade python3
apk info -v python3
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Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.