Is CVE-2026-42348 actively exploited?

No active exploitation of CVE-2026-42348 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42348 be exploited remotely?

Yes. CVE-2026-42348 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42348?

CVE-2026-42348 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-42348

CWE-789Published: May 12, 2026· Updated: May 13, 2026

5.9

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official Description

OpenTelemetry.OpAmp.Client is the OpAMP client for OpenTelemetry .NET. Prior to 0.2.0-alpha.1, when receiving responses from the OpAMP server over HTTP, the OpAMP client allocates an unbounded buffer to read all bytes from the server, with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured OpAMP server is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned in the response. This vulnerability is fixed in 0.2.0-alpha.1.

NVD Source

Technical Analysis

CVE-2026-42348 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 5.9.