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CVE-2026-42154

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CVE-2026-42154

Published: May 4, 2026

Modified: May 4, 2026

PUBLISHED

CVSS v3.1

7.5

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.

VendorProductVersions

prometheus

prometheus

affected
< 3.5.3
affected
>= 3.6.0, < 3.11.3

Weaknesses (CWE)

CWE-400
CWE-789

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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