{"id":"CVE-2026-42348","revision":null,"records":[{"revision":"8e4a4e031b78448fb7f88e4e38416c68","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-42348","aliases":[],"title":"OpAMP client reads unbounded HTTP response bodies","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.","state":0,"publishedAt":"2026-05-12T18:01:41.812+00:00","modifiedAt":"2026-05-13T19:32:28.404+00:00","affected":[{"ecosystem":"Vendor product","name":"opentelemetry-dotnet-contrib","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"open-telemetry\",\n                    \"product\": \"opentelemetry-dotnet-contrib\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.2.0-alpha.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-w2jh-77fq-7gp8","https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-42348","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-42348","identifiers":["CVE-2026-42348"]},"retained":false,"historicalAffected":[]},{"revision":"604b488bb463471289d05a0af6e8597b","observedAt":"2026-11-07T09:34:06.247+00:00","statement":{"source":"euvd","id":"EUVD-2026-29706","aliases":["CVE-2026-42348","GHSA-w2jh-77fq-7gp8"],"title":"OpenTelemetry.OpAmp.Client is the OpAMP client for OpenTelemetry .NET. 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This vulnerability is fixed in 0.2.0-alpha.1.","state":0,"publishedAt":"2026-05-12T18:17:24.7+00:00","modifiedAt":"2026-10-26T18:10:00.173+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116","https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-w2jh-77fq-7gp8"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42348","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-789"],"productCriteria":["cpe:2.3:a:opentelemetry:opentelemetry.opamp.client:*:*:*:*:*:.net:*:*"],"sourceDates":{"published":"2026-05-12T18:17:24.700","lastModified":"2026-10-26T18:10:00.173"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. 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This code path allows an unbounded read of the entire HTTP response message.\n\n### Impact\n\nIf an application using the OpAMP client is configured to use an OpAMP server that is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned in the response, the application could have its memory exhausted and create a denial-of-service condition.\n\n### Mitigation\n\nThe application's configured OpAMP server needs to behave maliciously. If the OpAMP server is a well-behaved implementation, response bodies should not be excessively large.\n\n### Workarounds\n\nNone known.\n\n### Remediation\n\n[#4116](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116) updates the OpAMP client HTTP transport to limit the maximum size of responses to 128KB.\n\n### Resources\n\n- [#2926](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/2926)\n- [#4116](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116)\n- [CWE-789](https://cwe.mitre.org/data/definitions/789.html)","state":0,"publishedAt":"2026-05-05T21:57:54+00:00","modifiedAt":"2026-05-13T16:46:20.709201+00:00","affected":[{"ecosystem":"NuGet","name":"OpenTelemetry.OpAmp.Client","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.2.0-alpha.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-w2jh-77fq-7gp8","https://nvd.nist.gov/vuln/detail/CVE-2026-42348","https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4116","https://github.com/open-telemetry/opentelemetry-dotnet-contrib/commit/bf1fad4fa298ff451cda0efb0ee9c7a7eb46212a","https://github.com/open-telemetry/opentelemetry-dotnet-contrib"],"sourceUrl":"https://github.com/advisories/GHSA-w2jh-77fq-7gp8","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-w2jh-77fq-7gp8","identifiers":["GHSA-w2jh-77fq-7gp8","CVE-2026-42348"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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