What’s Vulnerable › Vulnerabilities

CVE-2026-44967: opentelemetry-cpp: OTLP HTTP exporters read unbounded HTTP response

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-10-26
• Weakness: CWE-789

Description

OpenTelemetry-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.

Affected products

• open-telemetry opentelemetry-go: before 1.27.0 — fixed in 1.27.0

How to fix

Upgrade to a fixed version: open-telemetry opentelemetry-go 1.27.0. Check the vendor advisory for mitigations.

References

• https://github.com/open-telemetry/opentelemetry-cpp/issues/3958
• https://github.com/open-telemetry/opentelemetry-cpp/pull/4078
• https://github.com/open-telemetry/opentelemetry-cpp/security/advisories/GHSA-5qhm-4rfp-qqvj
• https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr-5gcm-pp58
• https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr-5gcm-pp58

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