Skip to main content
VulnerabilityPublished

CVE-2026-44213: open-telemetry opentelemetry-dotnet-contrib · Improper Certificate Validation

Affects open-telemetry opentelemetry-dotnet-contribSource CVE Database V5

0
Compare

Not known to be exploited · CVSS 6.5 Medium : upgrade to 1.1.0 when convenient.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.1.0
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade opentelemetry-dotnet-contrib and opentelemetry.exporter.instana to 1.1.0.

Affected software

ProductAffectedFixed in
open-telemetryopentelemetry-dotnet-contribAffected
  • <1.1.0
Fixed in
  • 1.1.0
NuGetopentelemetry.exporter.instanapkg:nuget/opentelemetry.exporter.instanaOther threatsAffected
  • <1.1.0
Fixed in
  • 1.1.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade the OpenTelemetry.Exporter.Instana NuGet package to version 1.1.0 or later, where this certificate validation issue is fixed. Avoid using vulnerable versions (<1.1.0) especially in environments where proxy usage is configured via INSTANA_ENDPOINT_PROXY. Patch status is not explicitly confirmed in a vendor advisory, so check the vendor's official sources for the latest remediation guidance.

Description

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.

References

Community reviews

Loading reviews…