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Vulnerability record · CVE-2018-1000808 · published 8 October 2018

CVE-2018-1000808: Pyopenssl project pyopenssl improper resource shutdown vulnerability

Pyopenssl Project · Pyopenssl

Python Cryptographic Authority pyopenssl version Before 17.5.0 contains a CWE - 401 : Failure to Release Memory Before Removing Last Reference vulnerability in PKCS #12 Store that can result in Denial of service if memory runs low or is exhausted. This attack appear to be exploitable via Depends upon calling application, however it could be as simple as initiating a TLS connection. Anything that would cause the calling application to reload certificates from a PKCS #12 store.. This vulnerability appears to have been fixed in 17.5.0.

5.9 CVSS 3.0 Medium EPSS 1.9% · top 21.1% CWE-404 · Improper resource shutdown
5.9CVSS 3.0 base score, v2 4.3
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

Python Cryptographic Authority pyopenssl version Before 17.5.0 contains a CWE - 401 : Failure to Release Memory Before Removing Last Reference vulnerability in PKCS #12 Store that can result in Denial of service if memory runs low or is exhausted. This attack appear to be exploitable via Depends upon calling application, however it could be as simple as initiating a TLS connection. Anything that would cause the calling application to reload certificates from a PKCS #12 store.. This vulnerability appears to have been fixed in 17.5.0.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.html
https://access.redhat.com/errata/RHSA-2019:0085 Third Party Advisory
https://github.com/pyca/pyopenssl/pull/723 PatchThird Party Advisory
https://usn.ubuntu.com/3813-1/ Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.html
https://access.redhat.com/errata/RHSA-2019:0085 Third Party Advisory
https://github.com/pyca/pyopenssl/pull/723 PatchThird Party Advisory
https://usn.ubuntu.com/3813-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-1000808), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.