The _Rsa15 class in the RSA 1.5 algorithm implementation in jwa.py in jwcrypto before 0.3.2 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartex
The _Rsa15 class in the RSA 1.5 algorithm implementation in jwa.py in jwcrypto before 0.3.2 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (MMA).
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | jwcrypto | < 0.4.0 | 0.4.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2016-6298
- https://github.com/latchset/jwcrypto/issues/65
- https://github.com/latchset/jwcrypto/pull/66
- https://github.com/latchset/jwcrypto/commit/eb5be5bd94c8cae1d7f3ba9801377084d8e5a7ba
- https://github.com/latchset/jwcrypto
- https://github.com/latchset/jwcrypto/releases/tag/v0.3.2
- https://github.com/pypa/advisory-database/tree/main/vulns/jwcrypto/PYSEC-2016-4.yaml
- https://web.archive.org/web/20200227230613/http://www.securityfocus.com/bid/92729
- http://www.securityfocus.com/bid/92729
- https://github.com/advisories/GHSA-wg33-x934-3ghh
- CVSS vector
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-200- Platform
- Python (PyPI)
- Package
jwcrypto- Disclosed
- 01.09.2016
- Updated
- 11.10.2026 12:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-wg33-x934-3ghh - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2016-4 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: jwcrypto
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
- 5
- First → latest
- 09.2016 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 5
Disclosures per year
- 2017: 0
- 2018: 0
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 1
- 2023: 1
- 2024: 1
- 2025: 0
- 2026: 1
earlier: 1
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The _Rsa15 class in the RSA 1.5 algorithm implementation in jwa.py in jwcrypto before 0.3.2 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartex this entry
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