High 7.5Published May 4, 2026

CVE-2026-42154Prometheus: remote read endpoint allows denial of service via crafted snappy payload

Updated under an hour ago (Oct 27, 2026, 1:30 AM ET)

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It affects prometheus and 20 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for prometheus

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-789, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Sep 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

prometheus prometheus prometheus:prometheus (from the name)	before 3.5.3; from 3.6.0, < 3.11.3	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:0.152.1-1.el10_2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:0.152.1-1.el10_0 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions redhat:rhel_e4s	from 0:0.152.1-1.el9_4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 0:0.152.1-1.el9_6 not affected	CISA ADP
Red Hat RHEM 1.0 for RHEL 9 redhat:edge_manager	from 0:1.0.3-1.el9em not affected	CISA ADP
Red Hat Logging for Red Hat OpenShift 6 redhat:logging	from 1785418915 not affected	CISA ADP
Red Hat Multicluster Global Hub 1.4.5 redhat:multicluster_globalhub	from 1784060681 not affected	CISA ADP
Red Hat OpenShift File Integrity Operator - FIO 1 redhat:openshift_file_integrity_operator	from 1786439449 not affected	CISA ADP
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 redhat:acm	from 1782374537 not affected	CISA ADP
1–10 of 22

References

References

https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm	x-refsource-confirm, vendor-advisory
https://github.com/prometheus/prometheus/pull/18584	x-refsource-misc, issue-tracking, patch
https://github.com/prometheus/prometheus/pull/18585	x-refsource-misc, issue-tracking, patch
https://github.com/prometheus/prometheus/releases/tag/v3.11.3	x-refsource-misc, release-notes
https://github.com/prometheus/prometheus/releases/tag/v3.5.3	x-refsource-misc, release-notes
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
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.