Medium 5.3Published Apr 8, 2026

CVE-2026-39882OpenTelemetry-Go OTLP HTTP exporters read unbounded HTTP response bodies

Updated under an hour ago (Oct 27, 2026, 12:10 AM ET)

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It affects open-telemetry opentelemetry-go and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for open-telemetry opentelemetry-go

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-telemetry opentelemetry-go open_telemetry:opentelemetry_go (from the name)	before 1.43.0	CNA record
opentelemetry opentelemetry opentelemetry:opentelemetry	before 1.43.0	NVD

References

References

https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr-5gcm-pp58	x-refsource-confirm, third-party-advisory
https://github.com/open-telemetry/opentelemetry-go/pull/8108	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.