Vulnerability in Open-Telemetry Opentelemetry-Cpp
CVE-2026-44967
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.
EPSS: 0.002 (10.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Open-telemetry Opentelemetry-cpp — versions < 1.27.0
- Opentelemetry
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Not Applicable, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44967?
- CVE-2026-44967 is a medium-severity vulnerability in Open-Telemetry Opentelemetry-Cpp, classified under CWE-789. CVSS score: 5.3/10. Published 2026-06-12.
- How severe is CVE-2026-44967?
- Medium severity. CVSS v3 base score is 5.3 out of 10.