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Fencer Vulns
medium 6.0

CVE-2026-17084 json

stringprep.map_table_b2() deviates from RFC 3454 Table B.2

published 2026-08-18 2 mo ago modified 2026-10-22 17 d ago also BIT-libpython-2026-17084 , BIT-python-2026-17084 , BIT-python-min-2026-17084 , EUVD-2026-60889

cvss
6.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami libpython 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8
  • bitnami python 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8
  • bitnami python-min 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8
  • Python Software Foundation CPython 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2
  • pypy3 Debian 14 8.0.1+dfsg-1
  • python3.11 Debian 12 3.11.2-6+deb12u9
  • python3.14 Debian 14 3.14.7-3
  • python3.15 Debian 14 3.15.0~rc2-1

debian advisories DEBIAN-CVE-2026-17084

  • python3.10 hummingbird 1 3.10.22-1.hum1
  • python3.10-idle hummingbird 1 3.10.22-1.hum1
  • python3.10-libs hummingbird 1 3.10.22-1.hum1
  • python3.10-test hummingbird 1 3.10.22-1.hum1
  • python3.10-tkinter hummingbird 1 3.10.22-1.hum1
  • python3.13 hummingbird 1 3.13.15-1.1.hum1
  • python3.13-idle hummingbird 1 3.13.15-1.1.hum1
  • python3.13-libs hummingbird 1 3.13.15-1.1.hum1

red hat advisories RHSA-2026:74868RHSA-2026:65567RHSA-2026:65531RHSA-2026:65525RHSA-2026:65513RHSA-2026:65505

  • python311 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Python 3 15 SP7 3.11.17-150600.3.74.1
  • python311-core SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Python 3 15 SP7 +1 more 3.11.17-150600.3.74.1
  • python313 SLE Module for Python 3 15 SP7 3.13.16-150700.4.61.1
  • python313-core SLE Module for Python 3 15 SP7 3.13.16-150700.4.61.1
  • python311 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +6 more 3.11.17-150400.9.105.1
  • python311-core SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +6 more 3.11.17-150400.9.105.1
  • python311-documentation SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 3.11.17-150400.9.105.1
  • python3 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 3.6.15-150300.10.129.1

suse advisories SUSE-SU-2026:4946-1SUSE-SU-2026:4941-1SUSE-SU-2026:4809-1SUSE-SU-2026:4754-1SUSE-SU-2026:4744-1SUSE-SU-2026:4743-1

  • python312 openSUSE Tumbleweed 3.12.14-2.1
  • python310 openSUSE Tumbleweed 3.10.21-2.1
  • python311 openSUSE Tumbleweed 3.11.16-2.1
  • python314 openSUSE Tumbleweed 3.14.7-2.1
  • python313 openSUSE Tumbleweed 3.13.15-1.1
  • python315 openSUSE Tumbleweed 3.15.0~rc2-1.1

opensuse advisories openSUSE-SU-2026:11975-1openSUSE-SU-2026:11949-1openSUSE-SU-2026:11886-1openSUSE-SU-2026:11868-1openSUSE-SU-2026:11817-1openSUSE-SU-2026:11748-1

  • python3 Alpine 3.23, Alpine 3.22, Alpine 3.21 3.12.15-r0
  • python3 Alpine 3.24 3.14.8-r0

alpine advisories ALPINE-CVE-2026-17084

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python3 Azure Linux 3.0 3.12.15-1

azure linux advisories AZL-96870

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-17084 updated cvss 6.5

python: Python stringprep module: Incorrect domain name processing breaks IDNA interoperability

  • Red Hat Hardened Images python3 3.14.7-1.1.hum1, python3.10 3.10.22-1.hum1, python3.14 3.14.7-1.1.hum1, python3.10 3.10.21-1.1.hum1, python3.11 3.11.16-1.2.hum1, python3.12 3.12.14-1.1.hum1, +32 more
    fixed: vendor fix RHSA-2026:65505
  • Red Hat Hardened Images hi/python
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
bitnami libpython
<3.10.22
>=3.11.0, <3.11.17
>=3.12.0, <3.12.15
>=3.13.0, <3.13.16
>=3.14.0, <3.14.8
3.10.22
3.11.17
3.12.15
3.13.16
3.14.8
bitnami python
<3.10.22
>=3.11.0, <3.11.17
>=3.12.0, <3.12.15
>=3.13.0, <3.13.16
>=3.14.0, <3.14.8
3.10.22
3.11.17
3.12.15
3.13.16
3.14.8
bitnami python-min
<3.10.22
>=3.11.0, <3.11.17
>=3.12.0, <3.12.15
>=3.13.0, <3.13.16
>=3.14.0, <3.14.8
3.10.22
3.11.17
3.12.15
3.13.16
3.14.8

Affected products

  • Python Software Foundation CPython

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.