CVE-2020-26409

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

A DOS vulnerability exists in Gitlab CE/EE >=10.3, <13.4.7,>=13.5, <13.5.5,>=13.6, <13.6.2 that allows an attacker to trigger uncontrolled resource by bypassing input validation in markdown fields.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-20 CWE-400

Affected software

Vendor	Product	Versions
GitLab	GitLab CE/EE	>=10.3; <13.4.7; >=13.5; <13.5.5; >=13.6; <13.6.2

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26409.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/259626Broken Link
https://hackerone.com/reports/990461Permissions Required
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26409.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/259626Broken Link
https://hackerone.com/reports/990461Permissions Required

Timeline

Published: Dec 11, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

CVE-2020-26416.0Vulnerability in the Enterprise Manager for Oracle Database product of Oracle Enterprise Manager (component: Discovery Framework). Supported CVE-2020-264114.3A potential DOS vulnerability was discovered in all versions of Gitlab starting from 13.4.x (>=13.4 to <13.4.7, >=13.5 to <13.5.5, and >=13.CVE-2020-264124.3Removed group members were able to use the To-Do functionality to retrieve updated information on confidential epics starting in GitLab EE 1 CVE-2020-264135.3An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.4 before 13.6.2. Information disclosure via GraphQL res CVE-2020-264146.5An issue has been discovered in GitLab affecting all versions starting from 12.4. The regex used for package names is written in a way that CVE-2020-264154.3Information about the starred projects for private user profiles was exposed via the GraphQL API starting from 12.2 via the REST API. This a CVE-2020-264164.4Information disclosure in Advanced Search component of GitLab EE starting from 8.4 results in exposure of search terms via Rails logs. This CVE-2020-264175.3Information disclosure via GraphQL in GitLab CE/EE 13.1 and later exposes private group and project membership. This affects versions >=13.6 CVE-2020-264185.3Memory leak in Kafka protocol dissector in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet injection or crafted captu CVE-2020-264195.3Memory leak in the dissection engine in Wireshark 3.4.0 allows denial of service via packet injection or crafted capture file.CVE-2020-26426.0Vulnerability in the Enterprise Manager Base Platform product of Oracle Enterprise Manager (component: Connector Framework). Supported versi CVE-2020-264205.3Memory leak in RTPS protocol dissector in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet injection or crafted captur