Observable Timing Discrepancy in pypqc
Impact
kyber512, kyber768, and kyber1024 on Mac OS (or when compiled with clang) only: An attacker able to submit many decapsulation requests against a single private key, and to gain timing information about the decapsulation, could recover the private key. Proof-of-concept exploit exists for a local attacker.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:P/RL:U/RC:C
Patches
No patch is currently available / pending upstream PQClean#556.
Workarounds
No workarounds have been reported. The 0.0.7 -> 0.0.7.1 upgrade, when available, should be a drop-in replacement<!--; it has no known breaking changes-->.
References
https://github.com/antoonpurnal/clangover
https://www.github.com/PQClean/PQClean/issues/556
https://www.github.com/pq-crystals/kyber/commit/9b8d30698a3e7449aeb34e62339d4176f11e3c6c
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | pypqc | >= 0.0.4, <= 0.0.6.2 | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:P/RL:U/RC:C- Weakness (CWE)
CWE-385, CWE-733- Platform
- Python (PyPI)
- Package
pypqc- Disclosed
- 05.06.2024
- Updated
- 11.10.2026 12:18
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hvh4-5qr6-3v7r - CC BY 4.0
Vulnerability history: pypqc
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 02.2024 06.2024
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 2
Disclosures per year
- 2024: 2
- 2025: 0
- 2026: 0
-
Observable Timing Discrepancy in pypqc this entry
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