Riskcovery

CVE-2026-42154

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

State
Published
Severity
7.5 High
Published
May 4, 2026
Updated
Sep 10, 2026
Reserved
Apr 24, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HGitHub_M
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hredhat-SADP

Weaknesses

  • CWE-400 Uncontrolled Resource Consumption
  • CWE-789 Memory Allocation with Excessive Size Value
  • CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

ProductVersions
prometheusprometheus
  • < 3.5.3Affected
  • >= 3.6.0, < 3.11.3Affected

References

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