CVE WatchJul 16, 2026

CVE-2026-42154

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/

CVSS

7.5

High

EPSS

0.8%

p51

KEV

—

Exploit Today

0-100

Published: May 4, 2026 · Last modified: Jul 16, 2026 · CWE-400 · CWE-789 · CWE-770

EPSS · 30d

0.7%EPSS · 30 days0.8%

2026-06-302026-07-16

Technical 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.

Official references

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