{"id":"UBUNTU-CVE-2026-42154","details":"Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process. This issue has been patched in versions 3.5.3 and 3.11.3.","modified":"2026-05-20T16:13:00.129679031Z","published":"2026-05-04T19:16:00Z","upstream":["CVE-2026-42154"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42154"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-42154"}],"affected":[{"package":{"name":"prometheus","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/prometheus?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.14.0+ds-1","0.16.2+ds-1","0.16.2+ds-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.16.2+ds-1ubuntu1","binary_name":"prometheus"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42154.json"}},{"package":{"name":"prometheus","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/prometheus?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.1+ds-1","1.8.1+ds-2","2.1.0+ds-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.1.0+ds-1","binary_name":"prometheus"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42154.json"}},{"package":{"name":"prometheus","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/prometheus?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.1+ds-3","2.15.2+ds-2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.15.2+ds-2","binary_name":"prometheus"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42154.json"}},{"package":{"name":"prometheus","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/prometheus?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.24.1+ds-1ubuntu1","2.24.1+ds-1ubuntu2","2.31.1+ds2-2","2.31.2+ds1-1","2.31.2+ds1-1ubuntu1","2.31.2+ds1-1ubuntu1.22.04.1","2.31.2+ds1-1ubuntu1.22.04.2","2.31.2+ds1-1ubuntu1.22.04.3","2.31.2+ds1-1ubuntu1.22.04.3+esm1","2.31.2+ds1-1ubuntu1.22.04.3+esm2","2.31.2+ds1-1ubuntu1.22.04.3+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.31.2+ds1-1ubuntu1.22.04.3+esm3","binary_name":"prometheus"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42154.json"}},{"package":{"name":"prometheus","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/prometheus?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.45.0+ds-3build1","2.45.1+ds-1","2.45.1+ds-2","2.45.1+ds-3","2.45.3+ds-2","2.45.3+ds-2build1","2.45.3+ds-2ubuntu0.1","2.45.3+ds-2ubuntu0.2","2.45.3+ds-2ubuntu0.2+esm1","2.45.3+ds-2ubuntu0.2+esm2","2.45.3+ds-2ubuntu0.3","2.45.3+ds-2ubuntu0.3+esm1","2.45.3+ds-2ubuntu0.3+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.45.3+ds-2ubuntu0.3+esm2","binary_name":"prometheus"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42154.json"}},{"package":{"name":"prometheus","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/prometheus?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.53.3+ds1-1","2.53.3+ds1-2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.53.3+ds1-2","binary_name":"golang-github-prometheus-prometheus-dev"},{"binary_version":"2.53.3+ds1-2","binary_name":"prometheus"},{"binary_version":"2.53.3+ds1-2","binary_name":"promtool"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42154.json"}},{"package":{"name":"prometheus","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/prometheus?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.53.3+ds1-2","2.53.5+ds1-2","2.53.5+ds1-3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.53.5+ds1-3","binary_name":"golang-github-prometheus-prometheus-dev"},{"binary_version":"2.53.5+ds1-3","binary_name":"prometheus"},{"binary_version":"2.53.5+ds1-3","binary_name":"promtool"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42154.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}