{"id":"CVE-2026-42154","aliases":["BIT-prometheus-2026-42154","GHSA-8rm2-7qqf-34qm","GO-2026-5264"],"url":"https://o3.security/vulnerability/CVE-2026-42154","summary":"Prometheus: remote read endpoint allows denial of service via crafted snappy payload","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.","published":"2026-05-04T18:13:12.340Z","modified":"2026-08-08T03:30:22.173243220Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/prometheus/prometheus","fixedVersion":"0.311.3"},{"ecosystem":"Go","name":"github.com/prometheus/prometheus","fixedVersion":"0.305.2"},{"ecosystem":"Go","name":"github.com/prometheus/prometheus","fixedVersion":null}],"fix":{"url":"https://github.com/prometheus/prometheus/pull/18584","label":"prometheus/prometheus#18584"},"references":[{"type":"WEB","url":"https://github.com/prometheus/prometheus/releases/tag/v3.11.3"},{"type":"WEB","url":"https://github.com/prometheus/prometheus/releases/tag/v3.5.3"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42154.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25039"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25245"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:29770"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30651"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34357"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34359"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34364"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34794"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36651"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36796"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40118"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40262"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40792"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40945"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40970"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40972"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40974"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41019"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41030"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41031"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41066"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42146"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42796"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42852"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:43052"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:44235"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:44263"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:44622"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:47149"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:47728"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:47952"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:48699"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:50843"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42154"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42154.json"},{"type":"ADVISORY","url":"https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42154"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2466505"},{"type":"FIX","url":"https://github.com/prometheus/prometheus/pull/18584"},{"type":"FIX","url":"https://github.com/prometheus/prometheus/pull/18585"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:30:22.173243220Z"}}