Detections
Analytics
CVE-2026-42154
high
Description
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.
References
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42154.json
https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm
https://github.com/prometheus/prometheus/releases/tag/v3.5.3
https://github.com/prometheus/prometheus/releases/tag/v3.11.3
https://github.com/prometheus/prometheus/pull/18585
https://github.com/prometheus/prometheus/pull/18584
https://bugzilla.redhat.com/show_bug.cgi?id=2466505
https://access.redhat.com/security/cve/CVE-2026-42154
https://access.redhat.com/errata/RHSA-2026:36796
https://access.redhat.com/errata/RHSA-2026:36651
https://access.redhat.com/errata/RHSA-2026:34364
https://access.redhat.com/errata/RHSA-2026:34359
https://access.redhat.com/errata/RHSA-2026:34357
https://access.redhat.com/errata/RHSA-2026:30651
https://access.redhat.com/errata/RHSA-2026:29770