Vulnerability in Open-Telemetry Opentelemetry-Go
CVE-2026-39882
OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to 1.43.0, the otlp HTTP exporters (traces/metrics/logs) read the full HTTP response body into an in-memory bytes.Buffer 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 1.43.0.
EPSS: 0.002 (9.0th 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-go — versions < 1.43.0
- Opentelemetry
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-39882?
- CVE-2026-39882 is a medium-severity vulnerability in Open-Telemetry Opentelemetry-Go, classified under CWE-789. CVSS score: 5.3/10. Published 2026-04-08.
- How severe is CVE-2026-39882?
- Medium severity. CVSS v3 base score is 5.3 out of 10.