CVE-2026-42191
- Source
- https://cve.org/CVERecord?id=CVE-2026-42191
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42191.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-42191
- Aliases
- Downstream
- Related
- Published
- 2026-05-12T19:12:03.221Z
- Modified
- 2026-07-08T08:13:13.686408475Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L CVSS Calculator
- Summary
- OpenTelemetry.Exporter.OpenTelemetryProtocol: Disk retry default temp path enables local blob injection for OTLP Exporter
- Details
-
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 OTELDOTNETEXPERIMENTALOTLPRETRY=disk was set but OTELDOTNETEXPERIMENTALOTLPDISKRETRYDIRECTORY_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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42191.json", "cwe_ids": [ "CWE-379" ], "cna_assigner": "GitHub_M" }- References
Affected packages
Git / github.com/open-telemetry/opentelemetry-dotnet
Affected ranges
- Type
- GIT
- Repo
- https://github.com/open-telemetry/opentelemetry-dotnet
- Events
- Database specific
{ "source": [ "AFFECTED_FIELD", "CPE_RANGE" ], "cpe": "cpe:2.3:a:opentelemetry:opentelemetry.exporter.opentelemetryprotocol:*:*:*:*:*:.net:*:*", "extracted_events": [ { "introduced": "1.8.0" }, { "fixed": "1.15.3" } ] }