CVE-2026-40891

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Source
https://cve.org/CVERecord?id=CVE-2026-40891
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-40891.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-40891
Aliases
Related
Published
2026-04-23T17:54:36.033Z
Modified
2026-04-28T12:02:26.184706Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40891.json",
    "cwe_ids": [
        "CWE-789"
    ]
}
References

Affected packages

Git / github.com/open-telemetry/opentelemetry-dotnet

Affected ranges

Type
GIT
Repo
https://github.com/open-telemetry/opentelemetry-dotnet
Events
Introduced
640cf63628567b76b348b26988920dbc0b5c1662
Fixed
d622e6c7c899527638b53a6b06919859f5752add
Database specific 
{
    "extracted_events": [
        {
            "introduced": "1.13.1"
        },
        {
            "fixed": "1.15.3"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

core-1.*
core-1.13.1
core-1.14.0
core-1.14.0-rc.1
core-1.15.0
core-1.15.1
core-1.15.2
coreunstable-1.*
coreunstable-1.13.1-beta.1
coreunstable-1.14.0-beta.1
coreunstable-1.15.0-beta.1
coreunstable-1.15.1-beta.1
coreunstable-1.15.2-beta.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-40891.json"