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Vulnerability record · CVE-2018-1000807 · published 8 October 2018

CVE-2018-1000807: Pyopenssl use after free vulnerability

Pyopenssl · Pyopenssl

Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.

8.1 CVSS 3.1 High EPSS 4.1% · top 9.7% CWE-416 · Use after free
8.1CVSS 3.1 base score, v2 6.8
4.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.

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

Affected products

6 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 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:0085 Third Party Advisory
https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509
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 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:0085 Third Party Advisory
https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509
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-2018-1000807), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.