Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison when checking whether two HMACs are equal. This could potentially allow attackers to use statistical methods to obtain a valid HMAC for an attacker-controlled input value.

Jenkins 2.219, LTS 2.204.2 now uses a constant-time comparison when validating HMACs.

Affected Packages

Maven org.jenkins-ci.main:jenkins-core

Affected versions: 0 (fixed in 2.204.2)

Maven org.jenkins-ci.main:jenkins-core

Affected versions: 2.205 (fixed in 2.219)

Related CVEs

CVE-2020-2102

Key Information

GHSA ID

GHSA-fj6f-6933-839j

Published

May 24, 2022 5:07 PM

Last Modified

December 19, 2022 9:06 PM

CVSS Score

5.0 /10

Primary Ecosystem

Maven

Primary Package

org.jenkins-ci.main:jenkins-core

GitHub Reviewed

✓ Yes

Dataset

Last updated: August 24, 2025 6:28 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.