Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-scbv-9xb1-kfa8
Vulnerability ID VCID-scbv-9xb1-kfa8
Aliases CVE-2026-42191
GHSA-4625-4j76-fww9
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-379 Creation of Temporary File in Directory with Insecure Permissions
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-42191
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-42191
epss 0.00016 https://api.first.org/data/v1/epss?cve=CVE-2026-42191
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-4625-4j76-fww9
cvssv3.1 6.5 https://github.com/open-telemetry/opentelemetry-dotnet
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet
cvssv3.1 6.5 https://github.com/open-telemetry/opentelemetry-dotnet/commit/78dffdc5ebdf3dc090fdb94e3f1a32d3d1e26dfd
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/commit/78dffdc5ebdf3dc090fdb94e3f1a32d3d1e26dfd
cvssv3.1 6.5 https://github.com/open-telemetry/opentelemetry-dotnet/pull/7106
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/pull/7106
ssvc Track https://github.com/open-telemetry/opentelemetry-dotnet/pull/7106
cvssv3.1 6.5 https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9
cvssv3.1_qr MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9
ssvc Track https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2026-42191
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-42191
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-42191
https://github.com/open-telemetry/opentelemetry-dotnet
https://github.com/open-telemetry/opentelemetry-dotnet/commit/78dffdc5ebdf3dc090fdb94e3f1a32d3d1e26dfd
https://nvd.nist.gov/vuln/detail/CVE-2026-42191
7106 https://github.com/open-telemetry/opentelemetry-dotnet/pull/7106
GHSA-4625-4j76-fww9 https://github.com/advisories/GHSA-4625-4j76-fww9
GHSA-4625-4j76-fww9 https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Found at https://github.com/open-telemetry/opentelemetry-dotnet
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Found at https://github.com/open-telemetry/opentelemetry-dotnet/commit/78dffdc5ebdf3dc090fdb94e3f1a32d3d1e26dfd
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Found at https://github.com/open-telemetry/opentelemetry-dotnet/pull/7106
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-13T14:16:04Z/ Found at https://github.com/open-telemetry/opentelemetry-dotnet/pull/7106
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Found at https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-13T14:16:04Z/ Found at https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-4625-4j76-fww9
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42191
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.02434
EPSS Score 0.00014
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:13.036680+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42191.json 38.6.0