The verify function in the RSA package for Python (Python-RSA) before 3.3 allows attackers to spoof signatures with a small public exponent via crafted signature padding, aka a BERserk attack.
CVE-2016-1494
This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 3.1%, top 13% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 5.3(medium)
- EPSS
- 93.4%
- KEV
- Not listed
Published
January 13, 2016
Last Modified
May 6, 2026
References (16)
- cve@mitrehttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html
- cve@mitrehttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html
- cve@mitrehttp://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html
- cve@mitrehttp://www.openwall.com/lists/oss-security/2016/01/05/1
- cve@mitrehttp://www.openwall.com/lists/oss-security/2016/01/05/3
- cve@mitrehttp://www.securityfocus.com/bid/79829
- cve@mitrehttps://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff
- cve@mitrehttps://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa/
- af854a3a-2127-422b-91ae-364da2661108http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html
- af854a3a-2127-422b-91ae-364da2661108http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html
- af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html
- af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/01/05/1
- af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/01/05/3
- af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/79829
- af854a3a-2127-422b-91ae-364da2661108https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| rsa | 1.1 ... 3.2.3 (18 versions) | 3.3 | — |
Data Freshness Timeline
(refreshed 9× in last 7d / 37× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-11 08:23 UTCEPSS rescore
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- 2026-06-23 17:50 UTCOSV refresh
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- 2026-05-23 00:10 UTCEG score recompute
- 2026-05-22 21:53 UTCEG score recompute
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- 2026-05-18 21:30 UTCEPSS rescore
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Frequently asked(5)
What is CVE-2016-1494?
When was CVE-2016-1494 disclosed?
Is CVE-2016-1494 actively exploited?
What is the CVSS score of CVE-2016-1494?
How do I remediate CVE-2016-1494?
Dependency Blast Radius
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