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TI-2026-14214 Aliases CVE-2026-17084GHSA-w246-x8qv-r8f5

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

Priority LOW 28CWE-436Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00734 54th percentileScored 2026-11-07
Fix Fixed CPython (Python Software Foundation): 3.10.22, 3.11.17, 3.12.15 +3Red Hat: 6 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Python Software FoundationCPythonbefore 3.10.22; 3.11.0 to before 3.11.17; 3.12.0 to before 3.12.15; 3.13.0 to before 3.13.16; 3.14.0 to before 3.14.8; 3.15.0a1 to before 3.15.0rc23.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2Patch availableCNA
  • CPython VendorPython Software Foundation Affected before 3.10.22; 3.11.0 to before 3.11.17; 3.12.0 to before 3.12.15; 3.13.0 to before 3.13.16; 3.14.0 to before 3.14.8; 3.15.0a1 to before 3.15.0rc2 Fixed in 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*——python-pillow
  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Versions — — ·python-pillow

Remediation

  • Fix · CNA CPython (Python Software Foundation) Fixed in 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2

Red Hat 6 advisories

  • RHSA-2026:74868 Released 2026-10-02 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.10-3.10.22-1.hum1@aarch64, python3.10-3.10.22-1.hum1@src, python3.10-3.10.22-1.hum1@x86_64 +12
  • RHSA-2026:65567 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.13-3.13.15-1.1.hum1@aarch64, python3.13-3.13.15-1.1.hum1@src, python3.13-3.13.15-1.1.hum1@x86_64 +16
  • RHSA-2026:65531 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.12-3.12.14-1.1.hum1@aarch64, python3.12-3.12.14-1.1.hum1@src, python3.12-3.12.14-1.1.hum1@x86_64 +12
Show 3 more Red Hat advisories
  • RHSA-2026:65525 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.11-3.11.16-1.2.hum1@aarch64, python3.11-3.11.16-1.2.hum1@src, python3.11-3.11.16-1.2.hum1@x86_64 +12
  • RHSA-2026:65513 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.10-3.10.21-1.1.hum1@aarch64, python3.10-3.10.21-1.1.hum1@src, python3.10-3.10.21-1.1.hum1@x86_64 +12
  • RHSA-2026:65505 Released 2026-09-08 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python-unversioned-command-3.14.7-1.1.hum1@noarch@public-hummingbird-aarch64-rpms, python-unversioned-command-3.14.7-1.1.hum1@noarch@public-hummingbird-x86_64-rpms, python3-3.14.7-1.1.hum1@aarch64 +28

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Python Software Foundation CPython 3.10.22, 3.11.17 and 4 more versions

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-13296 `HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matchingPriority MEDIUM 60
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:65505, RHSA-2026:65513, RHSA-2026:65525, RHSA-2026:65531, RHSA-2026:65567, RHSA-2026:74868
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-17084
  2. 2026-10-03 Alias added: GHSA-w246-x8qv-r8f5

References

Patch 9

Advisory 1

Other 1

  • TI-2024-07037 Quadratic complexity parsing cookies with backslashes CVSS 3.1HIGH 7.5
  • TI-2024-11791 Bypass extraction filter to modify file metadata outside extraction directory CVSS 3.1MEDIUM 5.3
  • TI-2024-00411 Quoted zip-bomb protection for zipfile CVSS 3.1MEDIUM 6.2
  • TI-2026-13296 `HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matching CVSS 4.0MEDIUM 6.0
  • TI-2024-06422 Email header injection due to unquoted newlines CVSS 3.1MEDIUM 5.5
  • TI-2026-04606 Possible to hijack modules in current working directory CVSS 4.0MEDIUM 5.6
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences