BIT-prometheus-2026-42154

Dashboard / Vulnerabilities / BIT-prometheus-2026-42154

BIT-prometheus-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.

References: https://access.redhat.com/errata/RHSA-2026:25039, https://access.redhat.com/errata/RHSA-2026:25245, https://access.redhat.com/errata/RHSA-2026:29770, https://access.redhat.com/errata/RHSA-2026:30651, https://access.redhat.com/errata/RHSA-2026:34357, https://access.redhat.com/errata/RHSA-2026:34359, https://access.redhat.com/errata/RHSA-2026:34364, https://access.redhat.com/errata/RHSA-2026:36651, https://access.redhat.com/errata/RHSA-2026:36796, https://access.redhat.com/security/cve/CVE-2026-42154, https://bugzilla.redhat.com/show_bug.cgi?id=2466505, https://github.com/prometheus/prometheus/pull/18584, https://github.com/prometheus/prometheus/pull/18585, https://github.com/prometheus/prometheus/releases/tag/v3.11.3, https://github.com/prometheus/prometheus/releases/tag/v3.5.3, https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm, https://nvd.nist.gov/vuln/detail/CVE-2026-42154, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42154.json, https://access.redhat.com/errata/RHSA-2026:34794, https://access.redhat.com/errata/RHSA-2026:40118, https://access.redhat.com/errata/RHSA-2026:40262, https://access.redhat.com/errata/RHSA-2026:40945, https://access.redhat.com/errata/RHSA-2026:40970, https://access.redhat.com/errata/RHSA-2026:40972, https://access.redhat.com/errata/RHSA-2026:40974, https://access.redhat.com/errata/RHSA-2026:41019, https://access.redhat.com/errata/RHSA-2026:41030, https://access.redhat.com/errata/RHSA-2026:41031, https://access.redhat.com/errata/RHSA-2026:41066, https://access.redhat.com/errata/RHSA-2026:40792, https://access.redhat.com/errata/RHSA-2026:42146, https://access.redhat.com/errata/RHSA-2026:42796, https://access.redhat.com/errata/RHSA-2026:42852, https://access.redhat.com/errata/RHSA-2026:43052, https://access.redhat.com/errata/RHSA-2026:44622, https://access.redhat.com/errata/RHSA-2026:44263, https://access.redhat.com/errata/RHSA-2026:47149, https://access.redhat.com/errata/RHSA-2026:44235, https://access.redhat.com/errata/RHSA-2026:47952, https://access.redhat.com/errata/RHSA-2026:47728, https://access.redhat.com/errata/RHSA-2026:48699, https://access.redhat.com/errata/RHSA-2026:50758, https://access.redhat.com/errata/RHSA-2026:50843, https://access.redhat.com/errata/RHSA-2026:53412, https://access.redhat.com/errata/RHSA-2026:53413, https://access.redhat.com/errata/RHSA-2026:53415, https://access.redhat.com/errata/RHSA-2026:53530, https://access.redhat.com/errata/RHSA-2026:54288, https://access.redhat.com/errata/RHSA-2026:56340, https://access.redhat.com/errata/RHSA-2026:56789, https://access.redhat.com/errata/RHSA-2026:56912, https://access.redhat.com/errata/RHSA-2026:60386, https://access.redhat.com/errata/RHSA-2026:59833