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CVE-2026-40891

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 fixe
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a72490f3c4c30cfefa57bf275923407bfb6a4037d2059d633f88f7fcd42b469a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"opentelemetry-dotnet","vendor":"open-telemetry","versions":[{"status":"affected","version":">= 1.13.1, < 1.15.3"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/affected/0

{"product":"OpenTelemetry.Exporter.OpenTelemetryProtocol","vendor":"open-telemetry","versions":[{"status":"affected","version":">= 1.13.1, < 1.15.3"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"product":"opentelemetry-dotnet","vendor":"open-telemetry","versions":[{"status":"affected","version":">= 1.13.1, < 1.15.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/affected/0
{"product":"OpenTelemetry.Exporter.OpenTelemetryProtocol","vendor":"open-telemetry","versions":[{"status":"affected","version":">= 1.13.1, < 1.15.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980","tags":["x_refsource_MISC"],"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/references/1
{"name":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064","tags":["x_refsource_MISC"],"url":"https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/references/2
{"name":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a2f87308e67c00c44ef4603cac2a218a912b4caefcad70b72a70ae8cd83bf79f · sha256:1b68acba6a26c8cc… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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