CVE-2020-13757

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-327

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/sybrenstuvel/python-rsa/issues/146Issue Tracking, Third Party Advisory
https://github.com/sybrenstuvel/python-rsa/issues/146#issuecomment-641845667Exploit, Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KILTHBHNSDUCYV22ODLOKTICJJ7JQIQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYB65VNILRBTXL6EITQTH2PZPK7I23MW/
https://usn.ubuntu.com/4478-1/Third Party Advisory
https://github.com/sybrenstuvel/python-rsa/issues/146Issue Tracking, Third Party Advisory
https://github.com/sybrenstuvel/python-rsa/issues/146#issuecomment-641845667Exploit, Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KILTHBHNSDUCYV22ODLOKTICJJ7JQIQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYB65VNILRBTXL6EITQTH2PZPK7I23MW/
https://usn.ubuntu.com/4478-1/Third Party Advisory

Timeline

Published: Jun 1, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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