The verify function in the RSA package for Python (Python-RSA) before 3.3 allows…
Priority LOW 34CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub. Impact type from CWE-347.
Summary
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.
Why it matters now
EPSS 0.06996 94th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed rsa (PyPI): 3.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | rsa (PyPI) | before 3.3 | 3.3 | Patch available | GHSA-8rjr-6qq5-pj9p |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- rsa (PyPI) Vendor— Affected before 3.3 Fixed in 3.3 Patch available GHSA-8rjr-6qq5-pj9p
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:python:rsa:*:*:*:*:*:python:*:* | before 3.3 | Vulnerable | python-pillow |
| cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:* | 22 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:* | 23 | Vulnerable | Fedoraproject |
| cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:* | 42.1 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:* | 13.1 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:* | 13.2 | Vulnerable | openSUSE |
- cpe:2.3:a:python:rsa:*:*:*:*:*:python:*:* Versions before 3.3 Vulnerable ·python-pillow
- cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:* Versions 22 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:* Versions 23 Vulnerable ·Fedoraproject
- cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:* Versions 42.1 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:* Versions 13.1 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:* Versions 13.2 Vulnerable ·openSUSE
Remediation
- Fix · GHSA-8rjr-6qq5-pj9p rsa (PyPI) Fixed in 3.3 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2016-1494
- 2026-10-03 Alias added: GHSA-8rjr-6qq5-pj9p
References
Patch 1
Advisory 6
Other 5
- https://github.com/sybrenstuvel/python-rsa/commit/ab5d21c3b554f926d51ff3ad9c794bcf32e95b3c
- https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa
- https://github.com/pypa/advisory-database/tree/main/vulns/rsa/PYSEC-2016-10.yaml
- https://github.com/sybrenstuvel/python-rsa
- https://web.archive.org/web/20210123020914/http://www.securityfocus.com/bid/79829
Sources
- CVE-2016-1494 · CVE Program
- CVE-2016-1494 · NVD
- FIRST EPSS
- GHSA-8rjr-6qq5-pj9p · GitHub Advisory Database · CC BY 4.0
- CVE-2016-1494 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences