opentelemetry-cpp: OTLP HTTP exporters read unbounded HTTP response

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Summary

CVECVE-2026-44967
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-12 16:16:27 UTC
Updated2026-06-12 17:16:23 UTC
DescriptionOpenTelemetry-cpp is the C++ implementation of OpenTelemetry. Prior to release 1.27.0, the OTLP HTTP exporters (traces/metrics/logs) read the full HTTP response into an in-memory vector of bytes without a size cap. This is exploitable for memory exhaustion when the configured collector endpoint is attacker-controlled (or a network attacker can MITM the exporter connection). This vulnerability is fixed in opentelemetry-cpp release 1.27.0.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-789 | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-telemetry Opentelemetry-cpp affected < 1.27.0 Not specified

References

ReferenceSourceLinkTags
github.com/open-telemetry/opentelemetry-cpp/pull/4078 [email protected] github.com
github.com/open-telemetry/opentelemetry-cpp/security/advisories/GHSA-5qh... [email protected] github.com
github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/open-telemetry/opentelemetry-cpp/issues/3958 [email protected] github.com
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