CVE-2026-17084 Affecting pypy3 package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published19 Aug 2026
- disclosed18 Aug 2026
Introduced: 18 Aug 2026
NewCVE-2026-17084 (opens in a new tab)How to fix?
There is no fixed version for Debian:unstable pypy3.
NVD Description
Note: Versions mentioned in the description apply only to the upstream pypy3 package and not the pypy3 package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-17084
- https://github.com/python/cpython/issues/155292
- https://github.com/python/cpython/pull/155293
- https://mail.python.org/archives/list/security-announce@python.org/thread/EUHHTC6EV7HCLSUHP25C5VHSV4V2MUZN/
- http://www.openwall.com/lists/oss-security/2026/08/18/2
- https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc
- https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7