CVE WatchAug 19, 2026

CVE-2026-17084

The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were u

CVSS

—

No CVSS

EPSS

0.5%

p40

KEV

—

Exploit Today

0-100

Published: Aug 18, 2026 · Last modified: Aug 19, 2026 · CWE-436

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-08-192026-08-28

Technical 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.

Official references

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