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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-8rm2-7qqf-34qm Prometheus: Remote read endpoint allows denial of service via crafted snappy payload
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

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

Wed, 12 Aug 2026 12:30:00 +0000


Tue, 26 May 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

threat_severity

Important


Mon, 11 May 2026 17:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*

Mon, 04 May 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 04 May 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Prometheus
Prometheus prometheus
Vendors & Products Prometheus
Prometheus prometheus

Mon, 04 May 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title Prometheus: remote read endpoint allows denial of service via crafted snappy payload
Weaknesses CWE-400
CWE-789
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-12T12:04:55.875Z

Reserved: 2026-04-24T17:15:21.835Z

Link: CVE-2026-42154

cve-icon Vulnrichment

Updated: 2026-08-12T12:04:55.875Z

cve-icon NVD

Status : Modified

Published: 2026-05-04T19:16:04.397

Modified: 2026-08-12T12:19:14.833

Link: CVE-2026-42154

cve-icon Redhat

Severity : Important

Publid Date: 2026-05-04T18:13:12Z

Links: CVE-2026-42154 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-26T14:00:06Z

Weaknesses