Missing brute-force protection in py-bcrypt
Priority LOW 38CWE-307Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-307.
Summary
The py-bcrypt module before 0.3 for Python does not properly handle concurrent memory access, which allows attackers to bypass authentication via multiple authentication requests, which trigger the password hash to be overwritten.
Why it matters now
EPSS 0.02835 86th percentileScored 2026-11-07
Fix Fixed py-bcrypt (py-bcrypt): 0.3py-bcrypt (PyPI): 0.3
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 |
|---|---|---|---|---|---|
| py-bcrypt | py-bcrypt | before 0.3 | 0.3 | Patch available | CNA |
| — | py-bcrypt (PyPI) | before 0.3 | 0.3 | Patch available | GHSA-r838-q6jp-58xx |
- py-bcrypt Vendorpy-bcrypt Affected before 0.3 Fixed in 0.3 Patch available CNA
- py-bcrypt (PyPI) Vendor— Affected before 0.3 Fixed in 0.3 Patch available GHSA-r838-q6jp-58xx
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:python:py-bcrypt:*:*:*:*:*:*:*:* | before 0.3 | Vulnerable | python-pillow |
| cpe:2.3:o:fedoraproject:fedora:17:*:*:*:*:*:*:* | 17 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:18:*:*:*:*:*:*:* | 18 | Vulnerable | Fedoraproject |
- cpe:2.3:a:python:py-bcrypt:*:*:*:*:*:*:*:* Versions before 0.3 Vulnerable ·python-pillow
- cpe:2.3:o:fedoraproject:fedora:17:*:*:*:*:*:*:* Versions 17 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:18:*:*:*:*:*:*:* Versions 18 Vulnerable ·Fedoraproject
Remediation
- Fix · CNA py-bcrypt (py-bcrypt) Fixed in 0.3
- Fix · GHSA-r838-q6jp-58xx py-bcrypt (PyPI) Fixed in 0.3 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2013-1895
- 2026-10-03 Alias added: GHSA-r838-q6jp-58xx
References
Advisory 5
- http://www.openwall.com/lists/oss-security/2013/03/26/2
- http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101387.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101382.html
- https://nvd.nist.gov/vuln/detail/CVE-2013-1895
- https://github.com/advisories/GHSA-r838-q6jp-58xx
Sources
- CVE-2013-1895 · CVE Program
- CVE-2013-1895 · NVD
- FIRST EPSS
- GHSA-r838-q6jp-58xx · GitHub Advisory Database · CC BY 4.0
- CVE-2013-1895 · 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