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CVE-2026-42154

HIGH · CVSS 7.5 EPSS 0.02% Public Exploit

Source: NVD + CISA KEV + EPSS · Published: 2026-05-04 · Last synced: 2026-06-03

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Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-42154
Severity
HIGH
CVSS
7.5
EPSS
0.02%

Original NVD 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.