{"id":"CVE-2026-40182","aliases":["GHSA-q834-8qmm-v933"],"url":"https://o3.security/vulnerability/CVE-2026-40182","summary":"OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies","details":"OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.","published":"2026-04-23T17:51:34.961Z","modified":"2026-07-15T01:49:20.493313944Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"NuGet","name":"OpenTelemetry.Exporter.OpenTelemetryProtocol","fixedVersion":"1.15.2"}],"fix":{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564","label":"open-telemetry/opentelemetry-dotnet#6564"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40182.json"},{"type":"ADVISORY","url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40182"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7017"},{"type":"FIX","url":"https://github.com/open-telemetry/opentelemetry-proto/pull/781"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:20.493313944Z"}}