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CVE-2026-81870VulnerabilityPublished Updated

Microsoft · OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-81870· Low 2.0

Not known to be exploited · CVSS 2.0 Low : upgrade to 1.45.0 when convenient.

Data as of 2 Nov 2026, 10:58 UTC

CVSS 4.0 base score
2.0Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 18% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.45.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Sep 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 2 Nov 2026.

What to do

Upgrade opentelemetry-go and github.com/open-telemetry/opentelemetry-go to 1.45.0.

Affected software

ProductAffectedFixed in
open-telemetryopentelemetry-goAffected
  • >=1.5.0 <1.45.0
Fixed in
  • 1.45.0
Gogithub.com/open-telemetry/opentelemetry-gopkg:golang/github.com/open-telemetry/opentelemetry-goOther threatsAffected
  • >=1.5.0 <1.45.0
Fixed in
  • 1.45.0

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

AI-suggested

Users should review logging configurations to avoid logging sensitive endpoint URLs in info logs until an official fix is released.

Description

A vulnerability in OpenTelemetry-Go version 3.0 causes exporter configuration logging to potentially leak endpoint URLs in informational logs. This could expose sensitive endpoint information through logs.

References

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