VULNERABILITY INTELLIGENCE

CVE-2026-42154

CVSS score7.5 HIGH
EPSS probability0.81%
CISA KEVNot currently listed
Published2026-05-04
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-400
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-770

Primary references