Medium 5.9Published May 12, 2026

CVE-2026-42348OpAMP client reads unbounded HTTP response bodies

Updated under an hour ago (Oct 27, 2026, 11:00 AM ET)

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It affects open-telemetry opentelemetry-dotnet-contrib and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-telemetry opentelemetry-dotnet-contrib open_telemetry:opentelemetry_dotnet_contrib (from the name)	before 0.2.0-alpha.1	CNA record
opentelemetry opentelemetry.opamp.client opentelemetry:opentelemetry.opamp.client	before 0.2.0	NVD

References

References

https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-w2jh-77fq-7gp8	x-refsource-confirm, patch, vendor-advisory
https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116	x-refsource-misc, issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.