CVE-2026-42154

May 4, 2026, 7:16 p.m.

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.

Product(s) Impacted

Vendor Product Versions
Prometheus
  • Prometheus
  • <3.5.3, <3.11.3

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-400
Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a prometheus prometheus <3.5.3 / / / / / / /
a prometheus prometheus <3.11.3 / / / / / / /

References

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

Tags

[email protected]
CWE-400
2026-05-04
CVE-2026-42154

CVSS Score

7.5 / 10

CVSS Data - 3.1

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Privileges Required: NONE
  • Scope: UNCHANGED
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: HIGH

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

    View Vector String

Timeline

Published: May 4, 2026, 7:16 p.m.
Last Modified: May 4, 2026, 7:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.