Denial of service via unbounded HTTP response
Published May 12, 2026 · Updated May 12, 2026
Denial of service in OpenTelemetry.OpAmp.Client before 0.2.0-alpha.1 allows attackers to exhaust application memory via an HTTP response. The HTTP transport calls ReadAsByteArrayAsync on HttpResponseMessage.Content and buffers the entire body without a size limit. Exploitation requires a malicious configured OpAMP server or man-in-the-middle attackers able to return an extremely large body, and the bounded consequence is memory exhaustion in the consuming application.
Summary
What happened
Denial of service in OpenTelemetry.OpAmp.Client before 0.2.0-alpha.1 allows attackers to exhaust application memory via an HTTP response. The HTTP transport calls ReadAsByteArrayAsync on HttpResponseMessage.Content and buffers the entire body without a size limit. Exploitation requires a malicious configured OpAMP server or man-in-the-middle attackers able to return an extremely large body, and the bounded consequence is memory exhaustion in the consuming application.
The record
- CVE
- CVE-2026-42348
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Vendor
- OpenTelemetry
- Product
- OpenTelemetry .NET Contrib
- Classifications
- CWE-789, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 12, 2026CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 0.2.0-alpha.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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