CVE-2026-42154highCWE-400 CWE-770 CWE-789

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

41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 7.5epss 0.8%

from disclosure to weapon11 days

Published on NVDMay 4

1st PoC+11d

exploitation probability

0.8%top 46% of all CVEs

observed exploitation

nono source reports it

1 public exploit(s)

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.

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

Affected products

prometheus · prometheus

public PoCs found — 1

githubgithub.com/ShadowByte1/CVE-2026-42154★ 0

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References