CVE-2026-44967 opentelemetry-cpp: OTLP HTTP exporters read unbounded HTTP response
An attacker controlling the collector endpoint or performing MITM can cause memory exhaustion in OpenTelemetry C++ OTLP HTTP exporters by sending unbounded responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44967?
CVE-2026-44967 is a medium-severity denial of service vulnerability in open-telemetry opentelemetry-cpp, published on 12 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-789
Which versions are affected by CVE-2026-44967?
It affects 1 product.
Products include Opentelemetry Opentelemetry.
How do I fix CVE-2026-44967?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-44967 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44967 exists.
Other vulnerabilities in open-telemetry opentelemetry-cpp
- CVE-2026-29181 OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)
- CVE-2023-47108 DoS vulnerability in otelgrpc (uncontrolled resource consumption) due to unbound cardinality metrics
- CVE-2023-45142 OpenTelemetry-Go Contrib has DoS vulnerability in otelhttp due to unbound cardinality metrics
- CVE-2023-43810 opentelemetry-instrumentation Denial of Service vulnerability due to unbound cardinality metrics
- CVE-2026-39883 opentelemetry-go: BSD kenv command not using absolute path enables PATH hijacking
Sources
Also known as AZL-90080, DEBIAN-CVE-2026-44967, UBUNTU-CVE-2026-44967.