CVE-2019-5736: runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host run…

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 25 Aug 2022. It cites 2 public reports, the first from 25 Aug 2022.

• cloudsek.com
• securelist.com

How likely is exploitation in the next 30 days?

98.5%

EPSS score, percentile 99.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (12)

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 30 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host runc binary (and consequently obtain host root access) by leveraging the ability to execute a command as root within one of these types of containers: (1) a new container with an attacker-controlled image, or (2) an existing container, to which the attacker previously had write access, that can be attached with docker exec. This occurs because of file-descriptor mishandling, related to /proc/self/exe.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

• RHSA-2019:0408 (Vendor advisory)
• RHSA-2019:0401 (Vendor advisory)
• RHSA-2019:0303 (Vendor advisory)
• tools.cisco.com (Vendor advisory)
• RHSA-2019:0304 (Vendor advisory)
• openSUSE-SU-2019:1079 (Vendor advisory)
• openSUSE-SU-2019:1227 (Vendor advisory)
• openSUSE-SU-2019:1275 (Vendor advisory)
• FEDORA-2019-bc70b381ad (Vendor advisory)
• FEDORA-2019-6174b47003 (Vendor advisory)
• RHSA-2019:0975 (Vendor advisory)
• openSUSE-SU-2019:1444 (Vendor advisory)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.

Source: CVE List, as of 30 Oct 2026. About the data.

Timeline