Is CVE-2026-42154 actively exploited?

No active exploitation of CVE-2026-42154 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42154 be exploited remotely?

Yes. CVE-2026-42154 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42154?

CVE-2026-42154 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-42154

CWE-400Published: May 4, 2026· Updated: May 7, 2026

7.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:5.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42154 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.