{"id":"CVE-2026-42191","sourceIdentifier":"security-advisories@github.com","published":"2026-05-12T20:16:41.000","lastModified":"2026-10-26T18:10:00.173","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"OpenTelemetry.Exporter.OpenTelemetryProtocol is the OTLP (OpenTelemetry Protocol) exporter implementation. From 1.8.0 to 1.15.2, the OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured. The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path. On multi-user systems where the temporary directory is accessible to other local accounts, this allows an attacker to write crafted *.blob files, read *.blob files written by the application between export failures, or deposit numerous or oversized blob files, degrading retry-loop performance or consuming disk space. This vulnerability is fixed in 1.15.3."},{"lang":"es","value":"OpenTelemetry.Exporter.OpenTelemetryProtocol es la implementación del exportador OTLP (OpenTelemetry Protocol). Desde 1.8.0 hasta 1.15.2, la característica de reintento en disco de OTLP en OpenTelemetry.Exporter.OpenTelemetryProtocol silenciosamente recurría a Path.GetTempPath() cuando se establecía OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk pero OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH no estaba configurado. El exportador almacenaba y cargaba archivos *.blob en subdirectorios fijos, con nombres de señal (trazas, métricas, registros) debajo de esa ruta raíz temporal compartida. En sistemas multiusuario donde el directorio temporal es accesible a otras cuentas locales, esto permite a un atacante escribir archivos *.blob manipulados, leer archivos *.blob escritos por la aplicación entre fallos de exportación, o depositar numerosos o sobredimensionados archivos blob, degradando el rendimiento del bucle de reintento o consumiendo espacio en disco. Esta vulnerabilidad está corregida en 1.15.3."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"open-telemetry","product":"opentelemetry-dotnet","versions":[{"version":">= 1.8.0, < 1.15.3","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW"},"exploitabilityScore":1.0,"impactScore":5.5},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-13T14:16:04.904029Z","id":"CVE-2026-42191","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-379"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:opentelemetry:opentelemetry.exporter.opentelemetryprotocol:*:*:*:*:*:.net:*:*","versionStartIncluding":"1.8.0","versionEndExcluding":"1.15.3","matchCriteriaId":"19F7C592-144A-4A5E-B4AB-AC191C96FC61"}]}]}],"references":[{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7106","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}