m2crypto Bleichenbacher timing attack - incomplete fix for CVE-2020-25657
A flaw was found in m2crypto. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | m2crypto | <= 0.40.1 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-50781
- https://access.redhat.com/security/cve/CVE-2023-50781
- https://bugzilla.redhat.com/show_bug.cgi?id=2254426
- https://gitlab.com/m2crypto/m2crypto
- https://gitlab.com/m2crypto/m2crypto/-/issues/342
- https://pypi.org/project/m2crypto
- https://github.com/advisories/GHSA-944j-8ch6-rf6x
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-203, CWE-208, CWE-385- Platform
- Python (PyPI)
- Package
m2crypto- Disclosed
- 05.02.2024
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1595 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-944j-8ch6-rf6x - CC BY 4.0
Vulnerability history: m2crypto
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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