TI-2026-32192 Aliases CVE-2026-44213 GHSA-wfr5-454p-mjc2

OpenTelemetry.Exporter.Instana bypasses TLS certificate validation when a proxy is configured

MEDIUM 62CWE-295Published 2026-05-26 · Updated 2026-05-27

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Spoofing
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.

Summary

The OpenTelemetry.Exporter.Instana exports telemetry to Instana backend. Prior to 1.1.0, the OpenTelemetry.Exporter.Instana NuGet package does not validate HTTPS/TLS certificates are valid when sending telemetry to a configured Instana back-end when a proxy is configured using the INSTANA_ENDPOINT_PROXY environment variable. If a network attacker can Man-in-the-Middle (MitM) the proxy connection, all OpenTelemetry telemetry data and the Instana API key are exposed to the attacker. This vulnerability is fixed in 1.1.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00207 10th percentileScored 2026-11-07

Fix Fixed opentelemetry-dotnet-contrib (open-telemetry): 1.1.0OpenTelemetry.Exporter.Instana (NuGet): 1.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
open-telemetry	opentelemetry-dotnet-contrib	before 1.1.0	1.1.0	Patch available	CNA
—	OpenTelemetry.Exporter.Instana (NuGet)	before 1.1.0	1.1.0	Patch available	GHSA-wfr5-454p-mjc2

opentelemetry-dotnet-contrib Vendoropen-telemetry Affected before 1.1.0 Fixed in 1.1.0 Patch available CNA
OpenTelemetry.Exporter.Instana (NuGet) Vendor— Affected before 1.1.0 Fixed in 1.1.0 Patch available GHSA-wfr5-454p-mjc2

Remediation

Fix · CNA opentelemetry-dotnet-contrib (open-telemetry) Fixed in 1.1.0
Fix · GHSA-wfr5-454p-mjc2 OpenTelemetry.Exporter.Instana (NuGet) Fixed in 1.1.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-44213
2026-10-03 Alias added: GHSA-wfr5-454p-mjc2

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-44213

Other 2

TI-2024-23957 OpenTelemetry Collector has a Denial of Service via Zip/Decompression Bomb sent over HTTP or gRPC CVSS 3.1HIGH 8.2
TI-2026-42706 OpenTelemetry JavaScript: Denial of service in `JaegerPropagator` via unhandled exception on a malformed header CVSS 3.1HIGH 7.5
TI-2026-33428 OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI CVSS 3.1HIGH 7.5
TI-2026-33427 OpenTelemetry eBPF Instrumentation: MongoDB parser panics on malformed wire messages CVSS 3.1HIGH 7.5
TI-2026-33420 OpenTelemetry eBPF Instrumentation: Postgres BIND parsing can panic on malformed payloads CVSS 3.1HIGH 7.5
TI-2026-32777 opentelemetry-js: Prometheus exporter process crash via malformed HTTP request CVSS 3.1HIGH 7.5

See all 62 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences