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Vulnerability details: VCID-w23h-teb2-uqgf
Vulnerability ID VCID-w23h-teb2-uqgf
Aliases CVE-2026-40891
GHSA-mr8r-92fq-pj8p
Summary OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS). This vulnerability is fixed in 1.15.2.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-789 Memory Allocation with Excessive Size Value
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 0.00019 https://api.first.org/data/v1/epss?cve=CVE-2026-40891
epss 0.00019 https://api.first.org/data/v1/epss?cve=CVE-2026-40891
epss 0.00019 https://api.first.org/data/v1/epss?cve=CVE-2026-40891
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-mr8r-92fq-pj8p
cvssv3.1 5.3 https://github.com/open-telemetry/opentelemetry-dotnet
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet
cvssv3.1 5.3 https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
ssvc Track https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
cvssv3.1 5.3 https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
ssvc Track https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
cvssv3.1 5.3 https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
cvssv3.1_qr MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
generic_textual MODERATE https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
ssvc Track https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2026-40891
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-40891
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-40891
https://github.com/open-telemetry/opentelemetry-dotnet
https://nvd.nist.gov/vuln/detail/CVE-2026-40891
5980 https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
7064 https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
GHSA-mr8r-92fq-pj8p https://github.com/advisories/GHSA-mr8r-92fq-pj8p
GHSA-mr8r-92fq-pj8p https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
No exploits are available.
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H 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:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
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:P/P:M/B:A/M:M/D:T/2026-04-23T18:22:43Z/ Found at https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
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:P/P:M/B:A/M:M/D:T/2026-04-23T18:22:43Z/ Found at https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
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:P/P:M/B:A/M:M/D:T/2026-04-23T18:22:43Z/ Found at https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-40891
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 0.05399
EPSS Score 0.00019
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:53:14.201759+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/40xxx/CVE-2026-40891.json 38.6.0