Prometheus: remote read endpoint allows denial of service via crafted snappy payload

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Summary

CVECVE-2026-42154
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-04 19:16:04 UTC
Updated2026-05-04 19:16:04 UTC
DescriptionPrometheus 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000210000 probability, percentile 0.057850000 (date 2026-05-05)

Problem Types: CWE-400 | CWE-789 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Prometheus Prometheus affected < 3.5.3 Not specified
CNA Prometheus Prometheus affected >= 3.6.0, < 3.11.3 Not specified

References

ReferenceSourceLinkTags
github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm [email protected] github.com
github.com/prometheus/prometheus/pull/18585 [email protected] github.com
github.com/prometheus/prometheus/pull/18584 [email protected] github.com
github.com/prometheus/prometheus/releases/tag/v3.5.3 [email protected] github.com
github.com/prometheus/prometheus/releases/tag/v3.11.3 [email protected] github.com
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